E&M GP Quiz End of Unit

What happens to the magnetic field strength around a wire if you double the current through it?

• It doubles.

• It cuts in half.

• It stays the same.

• It quadruples.

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Which two actions would make a magnetic field around a solenoid stronger?

• Decrease the number of coils

• Increase the number of coils

• Decrease the current

• Insert an iron core

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If two magnets are placed with their north poles facing each other, what force occurs?

• Repulsion

• Attraction

• No force

• Force depends on distance

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In electromagnetic induction, a current is produced when:

• A wire moves parallel to magnetic field lines.

• A wire cuts across magnetic field lines.

• A magnet is moved away from a coil without touching it.

• A magnet is kept still near a coil.

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According to Lenz's Law, the direction of an induced current always:

• Strengthens the original magnetic field.

• Weakens the original magnetic field.

• Opposes the change causing it.

• Supports the motion that caused it.

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Which two methods would increase the current generated when a magnet is pushed into a coil?

• Push the magnet faster.

• Push the magnet slower.

• Use a stronger magnet.

• Use fewer loops in the coil.

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When building a simple galvanometer, what caused the needle to deflect?

• A constant magnetic field.

• A moving magnet.

• A current through the coil.

• Friction between the coil and the air.

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In a galvanometer, what role does the magnetic field play?

• It keeps the coil still.

• It causes the coil to rotate when current flows.

• It increases the resistance.

• It converts mechanical energy to electrical energy.

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A wire moves through a magnetic field and experiences no induced current. Which two could explain why?

• The wire moves parallel to the field lines.

• The wire moves perpendicular to the field lines.

• The wire is stationary.

• The magnetic field is too strong.

If the direction of motion of the wire through a magnetic field is reversed, what happens to the induced current?

• Current stops.

• Current flows in the same direction.

• Current reverses direction.

• Current increases in strength.

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