Electromagnetism Review

Choose all of the generators

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Choose all of the motors.

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How does a motor work?

• Current generates an electric field around the loop of wire. The electric force causes the loop of wire to rotate.

• Current generates a magnetic field in the loop of wire that is then attracted and repelled by the magnet(s) in the motor.

• The magnets in the motor attract and repel the metal in the copper wire that makes up the loop. This causes the loop to rotate.

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Generators are devices that convert _____ energy into _____ energy.

• chemical; mechanical
• mechanical; electrical
• electrical; mechanical
• potential; kinetic

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How could you increase the magnetic field strength in this electromagnet? (choose all that apply)

• Increase the number of coils.

• increase the voltage

• decrease the number of coils.

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Which of these statements is true?

• A changing magnetic field induces a current in a conductor.

• Electricity and magnetism are related because a current-carrying conductor absorbs the compass of a needle.

• The Earth's magnetic and geographic North poles are relatively close to each other.

• Earth's magnetism comes from the core of the Sun.

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If you brought an unknown pole of a magnet near a North magnetic pole and they repel what is the unknown pole?

• North

• South

• Neutral

• not enough information

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If you brought an unknown pole of a magnet near a South magnetic pole and they attract what is the unknown pole?

• North

• South

• Neutral

• not enough information

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What do we know about Earth's Magnetic Field?

• It is likely caused my the molten iron core of the Earth.

• It protects us from solar winds.

• It causes the auroras.

• all of these are true.

Electromagnetism is magnetism produced by an electric current.

• True

• False

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