Practice Test

Question 1

Trent builds a model electric motor. When he connects a battery to the motor, the motor spins through a half rotation and stops. Which is the most likely solution to the problem?

Revolt · Accepted Answer

checking the commutator, because the current is not reversing

Question 2

Which device converts kinetic energy into electrical energy?

Revolt · Accepted Answer

an electric generator

Question 3

A charged particle moves at 2 point 5 times 10 to the 4th power m/s at an angle of 25 degrees to a magnetic field that has a field strength of 8 point 1 times 10 to the negative 2 power T If the magnetic force is 7 point 5 times 10 to the negative 2 power N , what is the magnitude of the charge?

Revolt · Accepted Answer

8 point 8 times 10 to the negative 5 power cap c

Question 4

Which labels belong in the regions marked X, Y, and Z?

Revolt · Accepted Answer

X: Thumb, for velocity Y: Fingers, for magnetic field Z: Palm of hand, for force

Question 5

Which statement best explains what was likely done to the nail?

Revolt · Accepted Answer

It was struck repeatedly, which caused the domains to randomize and the nail to become nonmagnetic.

Question 6

What change would most improve his results?

Revolt · Accepted Answer

moving the magnet faster

Question 7

Which labels belong in the regions marked X and Y?

Revolt · Accepted Answer

X: Repels or attracts other magnets Y: Attracts iron objects

Practice Test Answers

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