A negative charge is given to a nonconducting loop and the loop i… - Vidyadip

MCQ

$A$ negative charge is given to a nonconducting loop and the loop is rotated in the plane of paper about its centre as shown in figure. The magnetic field produced by the ring affects a small magnet placed above the ring in the same plane:

A
the magnet does not rotate
✓
the magnet rotates clockwise as seen from below.
C
the magnet rotates anticlockwise as seen from below
D
no effect on magnet is there.

✓

Answer

Correct option: B.

the magnet rotates clockwise as seen from below.

b
since the negative charge rotates clockwise, the magnetic field moves out of the plane inside the loop. Then it acts like a bar magnet with north pole out of the plane, and south pole inside the plane. The north pole of the bar magnet attracts the south pole of this equivalent bar magnet. Thus the magnet rotates clockwise as seen from below.

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