Electromagnetism

What forms closed circles around a current-carrying wire?

• Electric fields

• Magnetic fields

• Gravitational fields

• Light waves

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What surrounds an electric current?

• A magnetic field

• A sound wave

• A gravitational field

• A light wave

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Where is the magnetic field strongest around a wire?

• Farther from the wire

• Closer to the wire

• At the ends of the wire

• In the middle of the wire

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How can the strength of a magnetic field around a wire be increased?

• Decreasing the voltage

• Increasing the voltage

• Using a thicker wire

• Shortening the wire

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What is an electromagnet?

• A permanent magnet

• A temporary magnet made with a current-carrying wire coil

• A magnet that does not require electricity

• A magnet that repels all metals

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What is the effect of placing a magnetic material within a coil?

• It weakens the magnetic field

• It has no effect

• It strengthens the magnetic field

• It reverses the magnetic field

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What happens to the magnetic field when more wires run parallel to each other?

• It weakens

• It remains the same

• It strengthens

• It disappears

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What is the effect of increasing the current in a wire?

• Decreases the magnetic field

• Increases the magnetic field

• Has no effect

• Reverses the magnetic field

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How can the strength of an electromagnet be controlled?

• By changing the color of the wire

• By increasing the temperature

• By the number of loops in the wire coil

• By using a larger battery

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What happens when current flows in a wire coil in an electric motor?

• The coil becomes a permanent magnet

• The coil becomes an electromagnet

• The coil stops working

• The coil heats up

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