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Magnetism (Common properties of ALL magnets (North pole=magnetic south…
Magnetism
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Electrons and magnetism
electrons in constant produce a tiny magnetic field, caused by the charges
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When two electrons spin together, it makes 2x a magnet
When two electrons spin against each other, it cancels (which is why many substances are not magnets)
Magnetic fields
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Created by a magnet, spin of electron, or current
Direction of magnetic field is the direction in which a compass points at that location (remember north=magnetic south)
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B fields
When a charge goes through a magnetic field, it has a deflecting force
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Faraday discovered that force is perpendicular to direction of magnetic field and direction of electrical current
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Magnetic domains
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Magnets are demagnetized by excessive heating, hammering, and passing electricity
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Electromagnets
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Ex: MRI, loudspeaker, doorbells
Permanent magnets
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Made from iron, cobalt, and nickel
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