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Question

If the ends of a wire loop are attached to two half-circular metal strips, arranged so that the two strips almost form a complete circle, and those strips are contacted by two "brushes" which connect to opposite poles of a battery, what polarity of voltage will be measured as the loop is rotated counter-clockwise?

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A

Right Postive, Left Negative

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B
Right Negative, Left Positive
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C
There is actually no current.
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D
Can’t be determined
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Solution

The correct option is A

Right Postive, Left Negative


As the loop is moving anticlockwise, using Fleming’s left-hand rule we can determine that the current in the loop of wire is flowing anticlockwise. Therefore the polarity must be
Right - Positive
Left - Negative

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