Magnetism and Electromagnetism Review

As in the case of electric charges, like magnetic poles _________ each other.

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Within a magnetized object are tiny magnetic areas that can be organized or disorganized are called

Inside a __________________, mechanical energy is changed into electrical energy, as a current is induced when a magnet revolves around a wire.

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Like poles on a permanent magnet will

• attract each other

• repel each other

• always interact

• point in the same direction

The magnetic field lines around a bar magnet

• are perfectly straight

• are only perpendicular to the magnet

• spread out from one pole and curve around to the other

• cross back and forth over one another

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Electric currents passing through wires will produce a(n)

• solenoid

• magnet

• magnetic field

• insulator

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What makes an electromagnet different than a permanent magnet.....select all that apply

• it can be turned on and off

• it does not need any electricity

• its strength can be increased and decreased

• its polarity can be reversed

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Which way will NOT increase the strength of the magnetic field of an electromagent

• increasing the current

• using a stronger ferromagnetic core

• winding the coils closer together

• decreasing the number of loops

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What type of materials are needed to create an electromagnet?

• battery, light bulb, plastic straw

• battery, coil of wire, iron core

• generator, iron core, switch

• switch, source of electricity, compass

Moving a permanent magnet through a coil of wire will

• demagnetize the magnet

• the wire will become an electromagnet

• the magnet will become electrified

• a current will be generated in the wire

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