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1 What Determines the Strength of a Magnet | US Magnetix
https://usmagnetix.com/what-determines-the-strength-of-a-magnet/
Does bigger mean stronger? When you magnetize a piece of iron, the north-seeking poles of the atoms align. The force generated by the aligned ...
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2 Three Ways to Make an Electromagnet Stronger | Sciencing
https://sciencing.com/three-ways-make-electromagnet-stronger-5498690.html
The more powerful the external magnetic field that is applied, the greater the magnetization that results. This is the first of the factors that ...
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3 Questions and Answers - Why is it (in detail) that the more ...
https://education.jlab.org/qa/electromagnet_03.html
You can add more coils on top of the first row, and this just adds more field strength. In technical terms, every coil of wire increases the "magnetic flux ...
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4 What is the strongest magnetic field possible? Is there a limit?
https://wtamu.edu/~cbaird/sq/2014/08/21/what-is-the-strongest-magnetic-field-possible-is-there-a-limit/
The stronger the magnetic field gets, the more violently an electric charge is pushed sideways by the magnetic field, the faster and tighter it ...
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5 A method of producing strong magnetic fields - Journals
https://royalsocietypublishing.org/doi/10.1098/rspa.1924.0048
The first is by a solenoid, and the second by a solenoid with an iron core in it. The iron is introduced for the purpose of diminishing the magnetic resistance ...
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6 Electromagnet | CK-12 Foundation
https://flexbooks.ck12.org/cbook/ck-12-middle-school-physical-science-flexbook-2.0/section/22.4/primary/lesson/electromagnet-ms-ps/
In fact, electromagnets are the strongest magnets made. An electromagnet is stronger if there are more turns in the coil of wire or there is ...
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7 The strongest magnetic fields in the universe: how strong can ...
https://www.frontiersin.org/articles/10.3389/fphy.2014.00059/full
Magnetic fields in the universe are in general weak, of the order of μGauss only. However, in compact objects they assume extraordinarily large ...
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8 Strongest and Weakest Parts of a Magnet - ThoughtCo
https://www.thoughtco.com/magnetmagnetic-force-the-strongest-607864
The strength of the field varies depending on its location around the magnet. The magnetic field of a bar magnet is strongest at either pole of ...
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9 What are the four Ways to Make an Electromagnet Stronger?
https://byjus.com/question-answer/what-are-4-ways-to-make-an-electromagnet-stronger/
Electromagnets:An electromagnet is a type of magnet that generates a magnetic field by using an electric current. Electromagnets are typically made of wire ...
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10 20.1 Magnetic Fields, Field Lines, and Force | Texas Gateway
https://www.texasgateway.org/resource/201-magnetic-fields-field-lines-and-force
These areas are called the poles of a magnet. A magnetic pole is the part of a magnet that exerts the strongest force on other magnets or magnetic material, ...
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11 Making stronger electromagnets - IOPSpark - Institute of Physics
https://spark.iop.org/making-stronger-electromagnets
Increasing the number of coils (or turns) of wire · Increasing the electric current through the coil · Placing a magnetic material inside the solenoid coil.
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12 What are magnetic fields? (article) | Khan Academy
https://www.khanacademy.org/science/physics/magnetic-forces-and-magnetic-fields/magnetic-field-current-carrying-wire/a/what-are-magnetic-fields
Magnetic field lines naturally bunch together in regions where the magnetic field is the strongest. This means that the density of field lines indicates the ...
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13 Magnetism and the Sun: Magnetic Fields - Stanford Solar Center
http://solar-center.stanford.edu/magnetism/magneticfields.html
The magnetic field magnitude is proportional to the density of the lines. The closer together the field lines, the stronger the magnetic field.
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14 Stronger Electromagnets With More Turns | Physics Van | UIUC
https://van.physics.illinois.edu/ask/listing/2359
Hi Claire, We say that electric and magnetic fields are "linear" in that the total field from more than one source is the sum of the fields from all the ...
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15 How Magnetic Fields Are Created - Video & Lesson Transcript
https://study.com/academy/lesson/how-magnetic-fields-are-created.html
Several ways to make a magnetic field stronger include the addition of an electric current to charge the magnet field, increasing the magnitude of the ...
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16 Electromagnets - BBC Bitesize
https://www.bbc.co.uk/bitesize/topics/zrvbkqt/articles/z7922v4
Using more turns on the coil of wire will produce a stronger magnetic field. Coiling up a longer piece of wire adds up the magnetic field of each turn.
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17 Magnets and Electromagnets
http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/elemag.html
As can be visualized with the magnetic field lines, the magnetic field is strongest inside the magnetic material. The strongest external magnetic fields are ...
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18 Creating an Electromagnet - Activity - TeachEngineering
https://www.teachengineering.org/activities/view/cub_mag_lesson2_activity1
We can make this magnetic field stronger by increasing the amount of electric current going through the wire or we can increase the number ...
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19 Electromagnet - Wikipedia
https://en.wikipedia.org/wiki/Electromagnet
Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole in the center of ...
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20 The Electromagnet, Magnetic Coil and Permeability
https://www.electronics-tutorials.ws/electromagnetism/electromagnets.html
The resultant static magnetic field with a north pole at one end and a south pole at the other is uniform and a lot more stronger in the centre of the coil ...
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21 Read About Electric & Magnetic Fields | Science for Grades 6 ...
https://www.generationgenius.com/electric-and-magnetic-fields-reading-material-grades-6-8/
Like electric fields, magnetic fields also get stronger as you get closer to the magnet. A bigger magnet has a stronger magnetic field than a smaller magnet ...
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22 Electric Field vs Magnetic Field - Difference and Comparison
https://www.diffen.com/difference/Electric_Field_vs_Magnetic_Field
The closer the lines, the stronger the magnetic field and vice versa. When iron particles are placed over a magnet, the flux lines can be clearly seen.
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23 Circles of Magnetism - Exploratorium
https://www.exploratorium.edu/snacks/circles-of-magnetism
Make a magnetic field that's stronger than Earth's. ... A compass allows us to observe the direction of a magnetic field: compass needles are just little magnets ...
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24 Magnetism | National Geographic Society
https://www.nationalgeographic.org/encyclopedia/magnetism/
The force generated by the aligned atoms creates a magnetic field. The piece of iron has become a magnet. Some substances can be magnetized by ...
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25 Exploring Electromagnets - Science World
https://www.scienceworld.ca/resource/exploring-electromagnets/
When you bend the wire into a coil, the magnetic fields around each loop of the coil add up to make a long , thin magnet with north at one end and south at the ...
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26 Earth's Magnetic Field and its Changes in Time
https://image.gsfc.nasa.gov/poetry/tour/AAmag.html
Although the crust is solid, the core of the Earth is surrounded by a mixture of molten iron and nickle. The magnetic field of Earth is caused by currents of ...
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27 Magnet Sets World Record at 45.5 Teslas - IEEE Spectrum
https://spectrum.ieee.org/a-beachhead-to-superstrong-magnetic-fields
It's the strongest continuous DC magnetic field ever recorded and could help scientists study nuclear fusion and exotic states of matter.
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28 Record Breaking Magnetic Field 50 Million Times Stronger ...
https://www.newsweek.com/record-breaking-magnetic-field-stronger-earth-1125817
Scientists in Japan have created a magnetic field that is 50 million times stronger than the one surrounding Earth. This is a new world ...
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29 Earth's magnetic field
https://web.ua.es/docivis/magnet/earths_magnetic_field2.html
When conducting fluid flows across an existing magnetic field, electric currents are induced, which in turn creates another magnetic field. When this magnetic ...
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30 Strength of Electromagnets
https://www.sciencea-z.com/science/resource/SL_Gr_3_Effects_of_Forces_L4_all_printable_resources.pdf
kind of metal is inside the magnetic field, the magnet attracts it. ... How would you make an electromagnet that was stronger than any.
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31 Introduction to Magnetism and Induced Currents
https://www.rpi.edu/dept/phys/ScIT/InformationStorage/faraday/magnetism_a.html
A current traveling through a loop of wire creates a magnetic field along ... Magnetic fields permeate space and are strongest near a permanent magnet or ...
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32 Electromagnetism
https://ecampus.matc.edu/mihalj/scitech/unit3/electromagnets/electromagnetism.htm
This magnetic field becomes magnified when a current carrying wire is wrapped around an iron bar. The more windings around the iron bar, the stronger the ...
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33 Does the Shape of a Magnet Affect Its Strength?
https://www.jobmastermagnets.com/Does-the-Shape-of-a-Magnet-Affect-Its-Strength
How to Make a Magnet Stronger · For an iron bar magnet, add water to a bowl or pan. Put something that will float on the water in the bowl. · To ...
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34 Why is the magnetic field stronger at the edges of a bar magnet?
https://physics.stackexchange.com/questions/118882/why-is-the-magnetic-field-stronger-at-the-edges-of-a-bar-magnet
This is because of the divergence of the magnetic field of a bar magnet, which is what the core of the electromagnet essentially is. Researching ...
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35 Astronomers detect strongest known magnetic field in the ...
https://newatlas.com/space/strongest-magnetic-field-detected/
Astronomers have detected the strongest magnetic field ever observed in the universe. Studying powerful X-ray signals coming from a neutron ...
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36 Magnetic Field,
https://www.utm.edu/staff/cerkal/magnetic.htm
Under normal conditions, a magnetic material like iron doesn't behave like a magnet because the domains don't have a preferred direction of alignment. On the ...
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37 How to Make a Magnet Stronger - Science | HowStuffWorks
https://science.howstuffworks.com/how-to-make-magnet-stronger.htm
How to Make a Magnet Stronger · Iron bar magnets Fill a bowl or pan with some water. · Magnets that have lost their strength Sometimes you can ...
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38 New Record for Strongest Steady Magnetic Field - SciTechDaily
https://scitechdaily.com/1400000-times-stronger-than-earths-new-record-for-strongest-steady-magnetic-field/
On August 12, the hybrid magnet of the Steady High Magnetic Field Facility (SHMFF) in Hefei, China, generated the world's highest steady ...
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39 Understanding the Magnetic Field of a Bar Magnet | Nagwa
https://www.nagwa.com/en/videos/547154830313/
Jun 24, 2019
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40 1. Which of the following electromagnet will have the strongest...
https://www.cliffsnotes.com/tutors-problems/Physics/31548695-1Which-of-the-following-electromagnet-will-have-the-strongest-force/
-Adding more coils around the core makes a stronger magnet. 4. What was Hans Christian Oersted most known for? showing that the direction a current flows if ...
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41 How can a magnetic field be strengthened? - Quora
https://www.quora.com/How-can-a-magnetic-field-be-strengthened
By passing the field through a ferromagnetic material like iron. In the magnetic field ...
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42 Physicists Propose A Way to Make Magnetic Fields That Are ...
https://futurism.com/physicists-propose-a-way-to-make-magnetic-fields-that-are-stronger-than-any-on-earth
On the other hand, if this electromagnetic wave was passing through a magnetic medium when its polarization was altered, it generates a stronger magnetic field.
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43 Magnetic Field Around a Wire, I - MagLab
https://nationalmaglab.org/education/magnet-academy/watch-play/interactive/magnetic-field-around-a-wire-i
The magnetic field is strongest in the area closest to the wire, and its direction depends upon the direction of the current that produces ...
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44 Do other planets have magnetic fields like our Earth?
https://www.uu.edu/dept/physics/scienceguys/2004Sept.cfm
Jupiter, Saturn, Uranus, and Neptune all have magnetic fields much stronger than that of the Earth. Jupiter is the champion- having the largest magnetic ...
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45 Questions About Magnets Answered | First4magnets
https://www.first4magnets.com/tech-centre-i61/frequently-asked-questions-i69
By adding one magnet on to the other, e.g. stacking, the stacked magnets will work as one bigger magnet and will exert a greater magnetic performance. As more ...
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46 What Magnetic Fields Do to Your Brain and Body
https://www.discovermagazine.com/environment/what-magnetic-fields-do-to-your-brain-and-body
There's no escaping magnetic fields — they're all around us. For starters, the Earth itself is like a giant magnet.
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47 Watch the Strongest Indoor Magnetic Field Blast Doors of ...
https://www.smithsonianmag.com/smart-news/strongest-indoor-magnetic-field-blows-doors-tokyo-lab-180970436/
While the researchers were hoping that the field would reach 700 teslas, the unit used to measure magnetic flux density or informally, magnetic ...
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48 What causes magnetism? - Edinformatics
https://www.edinformatics.com/math_science/nature-of-magnets.html
If the majority of electrons in the atom spins in the same direction, a strong magnetic field is produced. The direction of the electrons spin determines the ...
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49 What Factors Affect the Strength of an Electromagnet?
https://www.sciencebuddies.org/teacher-resources/lesson-plans/strength-of-electromagnet
You can make the magnetic field much stronger by wrapping the wire into a coil, also called a solenoid. As long as each turn of the coil goes in the same ...
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50 Does Steel Block or Improve Magnetic Strength
https://www.kjmagnetics.com/blog.asp?p=block-or-extend
If the height is ¼” or greater, we expect a stronger field strength. The steel stretches or extends the strong field farther away from the magnet. In the graph, ...
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51 Chapter 21 Magnetism
https://www.sampson.k12.nc.us/cms/lib/NC01911190/Centricity/Domain/1023/Magnetism%20Guided%20Notes.docx.pptx
A magnetic field, which is strongest near the poles, will either attract or repel ... In few materials the unpaired electrons make a strong magnetic field ...
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52 Magnetism: A non-contact force
https://www.education.vic.gov.au/school/teachers/teachingresources/discipline/science/continuum/Pages/magnetism.aspx
The atoms in ferromagnetic materials are different because they can behave like little magnets. Normally the magnetic field around each atom ...
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53 Magnets and electricity - U.S. Energy Information ... - EIA
https://www.eia.gov/energyexplained/electricity/magnets-and-electricity.php
The properties of magnets are used to make electricity. Moving magnetic fields pull and push electrons. Metals such as copper and aluminum have electrons that ...
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54 Magnetic Field Strength - an overview | ScienceDirect Topics
https://www.sciencedirect.com/topics/engineering/magnetic-field-strength
Evidently a stronger field strength can be obtained by increasing the current. However, a more efficient method is to make multiple turns of the wire. Each turn ...
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55 How strong does a magnetic field have to be to affect the ...
https://www.sciencefocus.com/science/how-strong-does-a-magnetic-field-have-to-be-to-affect-the-human-body/
That said, international guidelines for public exposure to magnetic fields set an upper limit of 40 millitesla – around 1,000 times stronger than the Earth's ...
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56 What are magnetic fields and how do they shape the Universe?
https://www.skyatnightmagazine.com/space-science/what-are-magnetic-fields-how-do-they-affect-universe/
The presence of the field causes charged particles to gyrate around the magnetic field lines and when this happens, radio waves can be created.
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57 NOVA | What Drives Earth's Magnetic Field? - PBS
https://www.pbs.org/wgbh/nova/magnetic/reve-drives.html
In the Earth (see image below right), the liquid metal that makes up the outer core passes through a magnetic field, which causes an electric current to flow ...
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58 Electricity and Magnetism - Generators and Motors
https://micro.magnet.fsu.edu/electromag/electricity/generators/index.html
A conductor can be twisted into a coil, which efficiently produces current when cutting the lines of force in a magnetic field. The more turns ...
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59 What is a Magnetic Field? - Dowling Magnets
https://www.dowlingmagnets.com/blog/2015/what-is-a-magnetic-field/
Physical proximity (how close or far away) really counts in magnetism. The closer you stand to a magnet, the stronger the magnetic field will be. The farther ...
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60 An electric current can produce a magnetic field
https://www.harris.k12.ga.us/cms/lib/GA02202829/Centricity/Domain/341/currents_magnets.pptx
In fact, the magnetic field around a coil of wire produces a magnetic field ... core makes the magnetic field of the electromagnet a hundred times stronger.
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61 Electromagnetism - APlusPhysics
https://www.aplusphysics.com/courses/honors/magnets/electromagnetism.html
This is known as an electromagnet. You can make the magnetic field from the electromagnet even stronger by placing a piece of iron inside the coils of wire. The ...
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62 Magnetic field | Definition & Facts - Encyclopedia Britannica
https://www.britannica.com/science/magnetic-field
At the poles of a magnet, for example, where the magnetic field is strong, the field lines are crowded together, or more dense. Farther away, where the magnetic ...
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63 Copper - electromagnets. Making them stronger.
http://resources.schoolscience.co.uk/CDA/11-14/physics/copch33pg3.html
A bigger current will make a stronger magnet. However, there is a limit to how much current can flow in the wires before it gets too hot.
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64 The magnetic field of an electromagnet may be ... - Toppr
https://www.toppr.com/ask/question/the-magnetic-field-of-an-electromagnet-may-be-hundreds-of-times-stronger-than-the-magnetic/
An electromagnet is a combination of a solenoid and a core that is magnetized when current is passed through it.The magnetic field produced by electromagnet ...
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65 Magnets & Magnetism Frequently Asked Questions
https://www.intemag.com/magnetic-frequently-asked-questions
If a magnetic material is placed in a strong magnetic field, ... These materials make excellent temporary magnets, like those used in telephones and ...
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66 Magnetic fields of the human body - Physics Today
https://physicstoday.scitation.org/doi/pdf/10.1063/1.3069110
In contrast to other muscles in the body, the fibers of the heart muscle depolarize or "fire" synchronously; because of this the heart produces the strongest ...
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67 New research unlocks clues about Earth's magnetic field
https://www.rochester.edu/newscenter/new-research-unlocks-clues-about-earths-magnetic-field-413412/
Today's magnetic shield is generated in Earth's outer core. The intense heat in Earth's dense inner core causes the outer core—composed of ...
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68 Determine factors that affect electric and electromagnetic forces
https://www.varsitytutors.com/middle_school_physical_science-help/determine-factors-that-affect-electric-and-electromagnetic-forces
Electromagnets are made from copper wire coiled around a core. Iron placed inside the core makes the magnet stronger. When an electric current is sent through ...
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69 Magnets and Electromagnets 8.1
http://panchbhaya.weebly.com/uploads/1/3/7/0/13701351/phys12_c08_8_1.pdf
netic fields are strongest at the poles and that magnetic field lines fan out ... it produces a magnetic field in response to an applied magnetic field.
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70 Magnetism for kids - A simple introduction
https://www.explainthatstuff.com/magnetism.html
Make a sample of a magnetic material and hang it from a thread so it dangles in a magnetic field, and it will magnetize and line itself up so ...
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71 How Electromagnetic Coils Work - Circuit Basics
https://www.circuitbasics.com/how-electromagnetic-coils-work/
This is commonly used to increase the strength of a magnetic field. The more turns of wire on the coil, the stronger the magnetic field will be.
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72 How to Make Magnets Stronger?
https://www.stanfordmagnets.com/how-to-make-magnets-stronger.html
Firstly, you need to put the weak magnet within the magnetic field of a much larger, stronger magnet. To achieve the best result, you need to place it right ...
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73 What Are The Uses Of Electromagnets? - Universe Today
https://www.universetoday.com/39295/uses-of-electromagnets/
However, much stronger magnetic fields can be produced if a ferromagnetic material (i.e. iron) is placed inside the coil. This is what is called ...
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74 World's Strongest Magnetic Field | High-Temperature Magnets
https://www.popularmechanics.com/science/energy/a37924936/worlds-strongest-magnetic-field/
Scientists Just Generated the World's Strongest High-Temperature Magnetic Field ... It could be a major win for nuclear fusion. ... For the first ...
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75 The Earth's Magnetic Field - The Ocean Web
https://oceanweb.sites.oasis.unc.edu/www.unc.edu/depts/oceanweb/turtles/geomag.html
Intensity: The magnetic field also varies in strength over the earth's surface. It is strongest at the poles and weakest at the equator. Studying Responses of ...
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76 Curiosity Guide #509 Electromagnetism
https://mediad.publicbroadcasting.net/p/wkar/files/509-02-suspended-bowling-ball-curiosityguide.pdf
Increasing the number of coils of wire in the square makes the magnetic field stronger. Increasing the current flow from a higher voltage battery can also ...
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77 Technical Advice For Every Application - Magnet Expert
https://www.magnetexpert.com/technical-advice-i685
To make a permanent magnet, ferromagnetic material is heated at incredibly high temperatures, while exposed to a strong, external magnetic field. This causes ...
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78 Electricity & Magnetism
https://faculty.wcas.northwestern.edu/infocom/Ideas/electric.html
Electricity & Magnetism · 1) The electric force is created by electric charges. · 2) Static magnetic fields are not described by a simple formula, because magnets ...
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79 10.2 Magnetic field associated with a current | Electromagnetism
https://www.siyavula.com/read/science/grade-11/electromagnetism/10-electromagnetism-02
The circles are field lines and they also have a direction indicated by the arrows on the lines. Similar to the situation with electric field lines, the greater ...
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80 Permanent Magnets and Electromagnets - GeeksforGeeks
https://www.geeksforgeeks.org/permanent-magnets-and-electromagnets/
The magnetic field and strength are the main differences between permanent magnets and electromagnets. A wire-wound coil creates the ...
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81 Magnetism Flashcards | Quizlet
https://quizlet.com/98024648/magnetism-flash-cards/
A magnetic field exerts a force on other magnets and objects made of magnetic materials. The magnetic field is strongest close to the magnet and weaker far away ...
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82 What are electromagnetic fields? - Chelan PUD
https://www.chelanpud.org/docs/default-source/default-document-library/world-health-organization---what-are-electromagnetic-fields.pdf
What makes the various forms of electromagnetic fields so different? ... Like electric fields, magnetic fields are strongest close to their origin and ...
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83 Evidence of strong early magnetic field around Earth
https://www.sciencedaily.com/releases/2020/01/200121113046.htm
Today's magnetic shield is generated in Earth's outer core. The intense heat in Earth's dense inner core causes the outer core -- composed of ...
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84 Radiation: Electromagnetic fields
https://www.who.int/news-room/questions-and-answers/item/radiation-electromagnetic-fields
Electric fields are created by differences in voltage: the higher the voltage, the stronger will be the resultant field. Magnetic fields are created when ...
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85 Permanent Magnets and Electromagnets
https://www.magnetsource.com/blogs/blog2/permanent-magnets-and-electromagnets-different-magnet-types-feature-different-properties
The magnetic strength of permanent magnets largely depends on the material make-up of the magnet. Their inherent physical structures dictates the maximum amount ...
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86 Assignments » Unit 7 part 2 electromagnetism
https://www.richmond.k12.nc.us/RSHS/Class/863-mrs-faurot/Assignments/18138-Unit-7-part-2-electromagnetism.html
A: With more current, the magnetic field is stronger. Right Hand Rule. The direction of the magnetic field created when current flows through a wire depends on ...
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87 Strongest magnetic field did not produce exotic particles ...
https://www.newscientist.com/article/2306763-strongest-ever-magnetic-field-fails-to-make-predicted-exotic-particles/
“The stronger the magnetic field, the more and the heavier monopoles we can theoretically produce.” Nevertheless, the researchers found no ...
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88 What creates Earth's magnetic field? - Cosmos Magazine
https://cosmosmagazine.com/earth/earth-sciences/what-creates-earths-magnetic-field/
On Earth, flowing of liquid metal in the outer core of the planet generates electric currents. The rotation of Earth on its axis causes these ...
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89 Earth's magnetic field: Explained - Space.com
https://www.space.com/earths-magnetic-field-explained
What causes Earth's magnetic field? How does the magnetic field protect Earth? Magnetic pole reversal; Magnetic fields on other planets ...
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90 Magnetic field - Energy Education
https://energyeducation.ca/encyclopedia/Magnetic_field
Magnetic fields are produced by changing electric fields, usually through moving charges such as electrons, often in the form of a macroscopic electric ...
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91 Magnetic Fields and Inductance | Inductors - All About Circuits
https://www.allaboutcircuits.com/textbook/direct-current/chpt-15/magnetic-fields-and-inductance/
Coil cores made of ferromagnetic materials (such as soft iron) will encourage stronger field fluxes to develop with a given field force than nonmagnetic ...
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92 What is a magnetic field? How can we measure it and see its ...
https://www.joliet86.org/assets/1/6/Week_10_Science_(English)_What_is_a_Magnetic_Field_Day_1.pdf
What makes a magnetic field? Magnetic fields are created by moving electric charge. When electrons, which have a negative charge, move around in certain ...
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93 The Outer Planets: Giant Planets: Magnetospheres
https://lasp.colorado.edu/outerplanets/giantplanets_magnetospheres.php
The stronger the magnetic field, the larger the magnetosphere. Some 20,000 times stronger than Earth's magnetic field, Jupiter's magnetic field creates a ...
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94 Electromagnetism - Swiss Nanoscience Institute
https://nanoscience.ch/wp-content/uploads/sites/8/2020/06/en_elektromagnetismus_en-sketch.pdf
Many electromagnets also have an iron core to make the magnetic field stronger. The more times the wire is wound around the coil, the stronger the magnetic ...
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