If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity?
Aequal to that of disc and in the same direction
Bless than that of disc but in opposite direction
Cless than that of disc and in the same direction
Dequal to that of disc and in the opposite direction
Correct answer
C. less than that of disc and in the same direction
Explanation
The correct answer is less than that of disc and in the same direction.