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Magnetism and Electromagnetism — Test Answers

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A magnetically soft material is placed in a strong magnetic field. What is the most likely outcome?

A
It will become a permanent magnet because the domains will easily realign.
B
It will become a temporary magnet because the domains will easily realign.
C
It will become a permanent magnet because the domains will remain aligned.
D
It will become a temporary magnet because the domains will remain aligned.
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Which part of the motor is responsible for reversing the flow of current?

A
W
B
X
C
Y
D
Z
25

The wire is then connected to a battery so that a current flows down the wire. How will the compasses point once the current is flowing?

A
Image with description A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing counterclockwise.
B
Image with description A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing in the same direction, west.
C
Image with description A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing in the same direction, east.
D
Image with description A long wire that is vertical and standing on a steel plate. There are 4 compasses surrounding it and all of the needles are pointing clockwise.

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