Magnetic materials that turn into a magnet when they're put into a magnetic field. The force between permanent and induced magnets is always attractive.
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A current flowing through a wire creates a
Magnetic field around the wire. The field is made up of concentri circles perpendicular to the wire.
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A solenoid is a coil of wire.
The strenght of the magnetic field can be increased by wrapping thw ire into a coil called a solenoid. This results in lots of field lines poitning in the same direction very close together.
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An electromagnet is
A magnet whose magnetic field can be turned on and off with an electric current.
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Cutting field lines induces a
Potential difference, and a current if the conductor is art of a complete circuit.
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Induced current always
Opposes the change that made it.
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Alternators
Generate alternating current
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Dynamos
Generate direct current
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Microphones
Generate current from sound waves.
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Transformers change the Potential difference
but only for alternating current.
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Other cards in this set
Card 2
Front
Induced magnets
Back
Magnetic materials that turn into a magnet when they're put into a magnetic field. The force between permanent and induced magnets is always attractive.
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