A bar magnet is held perpendicular to a uniform magnetic field. If the – McqOptions

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1.	A bar magnet is held perpendicular to a uniform magnetic field. If the couple acting on the magnet is to be halved by rotating it, then the angle by which it is to be rotated is [CBSE PMT 2000]
A.	30o
B.	45o
C.	60o
D.	90o
Answer» D. 90o

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