If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity *
a) Less than that of disc but in opposite direction
b) Equal to that of disc and in the same direction
c) Equal to that of disc and in the opposite direction
d) Less than that of disc and in the same direction
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4
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I don't know sorry I m really sorry
Answered by
1
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When the copper plate is rotated below a freely suspended magnetic needle, there will be a relative velocity between the field of magnetic needle and rotating copper disc. Due to this relative velocity, a circulating current will be induced inside the copper plate. According to the working principle of the induction motor, the needle starts rotating in the same direction but with lesser velocity.
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