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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

0.064 J

B

`-0.064 J`

C

Zero

D

`-0.082 J`

Text Solution

Verified by Experts

The correct Answer is:
B
`U= -MBcostheta`
`U= -MBcos0= -0.4xx0.16=-0.064`
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