magnetic effects of current
A negative charge is given to a nonconducting circular loop and the loop is rotated in the plane of paper about its centre as shown in figure. The magnetic field produced by the loop affects a small magnet placed above the loop in the same plane :
(A) the magnet does not rotate seen from below
(C) the magnet rotates anticlockwise as seen from below
(D) no effect on magnet is there
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