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Published byDwayne Cummings Modified over 9 years ago
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Magnetism
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Magnets Any material that creates a magnetic field Any material that creates a magnetic field –Some materials can be made into permanent magnets. Hard magnetic material- difficult to magnetize but hold the magnetism. Soft magnetic material- easy to magnetize but lose magnetism easily. –Magnets exert magnetic force on each other.
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Magnetic poles- one of 2 points (end) of the magnet that have opposing magnetic properties. Magnetic poles- one of 2 points (end) of the magnet that have opposing magnetic properties. –Like poles repel, and opposite poles attract
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Magnetic Fields Magnetic Fields- a region where a magnetic force can be detected. Created by magnets. Magnetic Fields- a region where a magnetic force can be detected. Created by magnets.
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Compasses can track magnetic fields. Compasses can track magnetic fields. Earth’s magnetic field is like that of a bar magnet. Earth’s magnetic field is like that of a bar magnet.
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Magnetism from Electric Currents 1820- Danish science teacher, Hans Christian Oersted found that magnetism is produced by moving electric charges. 1820- Danish science teacher, Hans Christian Oersted found that magnetism is produced by moving electric charges. Actually- it’s the moving electrons around the nucleus of an atom that make the magnetic field. Actually- it’s the moving electrons around the nucleus of an atom that make the magnetic field.
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Electric Currents from Magnetism 1831- Michael Faraday discovered that a current can be produced by pushing a magnet through a coil of wire (moving in and out)- causing charges in the wire to move = current. 1831- Michael Faraday discovered that a current can be produced by pushing a magnet through a coil of wire (moving in and out)- causing charges in the wire to move = current. FARADAY’S LAW: An electric current can be produced in a circuit by a changing magnetic field. FARADAY’S LAW: An electric current can be produced in a circuit by a changing magnetic field.
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