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A magentic dipole in a constant magnetic...

A magentic dipole in a constant magnetic field has

A

zero potential energy when the torque is maximum.

B

minimum potential energy when the torque is maximum

C

maximum potential energy when the torque is maximum.

D

zero potential energy when the torque is minimum.

Text Solution

Verified by Experts

The correct Answer is:
A
When a magnetic dipole of dipole moment M is placed in a uniform magnetic field B, it will experience a torque,
`tau=MB sin theta`
Torque is maximum when `theta=90^(@), U=-MB cos theta=-MB cos 90^(@)=0`
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