Electromagnetism

What happens when an electric current flows through a wire?

• The wire begins to spin.

• Nothing happens.

• A field of gravity is created around the wire.

• A magnetic field is created around the wire.

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What does this image show?

• Parallel circuit

• Series circuit

• Magnet

• Electromagnet

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How can a magnet be used to produce an electric current?

• Hold a magnet next to a piece of wire.

• Wrap wire around a magnet.

• Spin the magnet around inside a coil of wire.

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Increasing the number of coils in an electromagnet will _________ the power of the magnet.

• decrease

• increase

• not affect

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

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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A current is produced when _______________ flow in a circuit.

• protons

• neutrons

• electrons

• nucleons

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What is/are the difference(s) between a magnet and an electromagnet?

• An electromagnet can be turned on/off.

• A magnet can be turned off.

• An electromagnet is stronger.

How is Earth’s magnetic field similar to that of a magnet?

• It is hundreds of miles long.

• It is shaped like a horseshoe.

• It has North and South poles

• It is made in Earth’s core.