Magnetic Forces

What happens if you hold the south pole of one magnet close to the north pole of another magnet?

• They will attract each other

• They will repel each other

• They will grow very hot

• Nothing will happen

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

• A. Directed to the right

• A. Directed to the left

• A. Equal to the magnetic field

• In the same direction as the magnetic field

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Solenoid #1 has a length L, cross-sectional area A, and N turns. Solenoid #2 has a length 2L, cross-sectional area 2A, and 2N turns. Which solenoid has the greater magnetic field at its center when equal currents are going through them?

• #1

• #2

• Both have the same magnetic field.

• Since it depends on the values of A and L, none of the above are correct

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Compared to the magnetic field in coil A, the magnetic field in coil B is --- as big.

• 4/3 ×

• 3/4 ×

• 1×

• 8 ×

• 1/6 ×

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The voltmeter is at 0 in this image. How would you manipulate the experiment to create electricity (measured in volts)?

• Flip the magnet around so the North pole is facing out
• Move the magnet back and forth
• Take the magnet out
• Add more coils around the paper cylinder

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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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