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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

`–0.64 J `

B

Zero

C

`–0.082 J `

D

`–0.064 J `

Text Solution

Verified by Experts

The correct Answer is:
D
`U=-MB cos theta`
for stable equilibrium `theta=0^@`
U = – MB = – (0.4) (0.16) = – 0.064 J
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