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A short bar magnet of magnetic moment 0*...

A short bar magnet of magnetic moment `0*4JT^-1` is placed in a uniform magnetic field of `0*16T`. The magnet is in stable equilibrium when the potential energy is

A

`-0.64J`

B

zero

C

`-0.082J`

D

-`0.064J`

Text Solution

Verified by Experts

The correct Answer is:
D
We know that
`U=-MB cos theta`
For stable equilibrium `theta=0^(@)`
So, `U=-MB
=-(0.4)(0.16)=-0.064 J`
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