Electromagnetic Forces Review

What subatomic particle causes magnetism in an atom? 

• protons
• neutrons
• electrons
• nucleus

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This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

• Add more coils of wire to the nail.
• Use a smaller battery.
• Reverse the poles of the magnet.
• Remove all the coils and the nail.

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How are electromagnets different from magnets?

• magnets can be turned on/off
• you can turn an electromagnet on/off
• magnets are more powerful
• magnets have a North and South pole

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A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:

• Directed to the right

• Directed to the left

• Equal to the magnetic field

• In the same direction as the magnetic field

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A device that converts mechanical energy into electrical energy

• A. electric generator
• B. electric motor
• C. electromagnetic induction
• D. mechanical  generator

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A magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils doubles, the induced voltage

• quadruples

• doubles

• is the same

• halves

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Electromagnetism is when

• magnetism causes electricity

• electricity causes magnetism

• electricity and magnetism cancel each other out

• a strong magnet creates a permanent magnet

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A group of students investigating electromagnetism sets up a wire flat on a table, along with three compasses as shown. Once they hook the wire to a battery, the students see the compasses do nothing. What explains their results?

• The magnetic field is going straight up / down where the compasses are, and they can't turn to point that way.

• They only investigated one variable, which isn't enough to get results.

• They have verified that a current doesn't create magnetic field.

• Current cannot flow without something like a light bulb or other resistor

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What energy transformation takes place in an electric fan's motor?

• electrical energy into kinetic mechanical energy

• kinetic mechanical energy into electrical energy

• alternating current to direct current

• electrical energy to electric power

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Making an electromagnet stronger would not involve which of the following?

• More current in the wire

• Making the loops wider

• Packing the loops tighter together

• Having more loops

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