Question

a bar magnet is held perpendicular to a uniform magnetic field. If the torque of couple acting on the magnet is to be
halved by rotating it, then the angle by which it is to be rotated is
a. 30
b. 45
c. 60
d. 90 degrees
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Answer 1

Answer:

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Explanation:

it's answer is 90 degree

Answer 2

Answer:

i think it will be 90° as the torque also act as the couple of magnetic field