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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 potencial energy is

A

`-0.082 J`

B

0.064J

C

`-0.064J`

D

Zero

Text Solution

Verified by Experts

The correct Answer is:
C
At stable equilibrium `theta= 0^(@)`
`rArr U_("min") = - MB = - 0.4 xx 0.16= - 0.064J`
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