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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

`-0.082J`

B

0.064J

C

`-0.064J`

D

Zero

Text Solution

Verified by Experts

The correct Answer is:
C
`U=-MBcostheta`
= `-0.4xx0.16xxcos0^(@)`
= -0.064 J
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