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Magnetism and Electromagnetism — Test Answers

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Which functions belong in the cells marked X and Y?

X: Conducts current to the armature and reverses direction of current Y: Rotates as a result of changing magnetic forces

X: Allows current to flow into the commutator Y: Rotates as a result of changing magnetic forces

X: Rotates as a result of changing magnetic forces Y: Conducts current to the armature and reverses direction of current

X: Allows current to flow into the commutator Y: Conducts current to the armature and reverses direction of current

What is the best conclusion that can be drawn?

A current flows, but its direction cannot be known.

A current flows down the wire.

A current does not flow in the wire.

A current flows up the wire.

What change would enable Gazala to pick up eight paper clips?

wrapping the wire around the nail more times

unwrapping several loops of the wire from the nail

reversing the nail and using the nail’s head

reversing the battery

Which part of the motor is responsible for reversing the flow of current?

What is the direction of the magnetic field at point Z?

out of the screen

into the screen

left

right

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