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A short bar magnet pleaced with its axis...

A short bar magnet pleaced with its axis at `30^(@)` with a uniform external magnetic field of `0.16` Tesla expriences a torque of magnitude `0.032` Joule. The magnetic moment of the bar magnet will be

A

0.4 J/T

B

0.3 J/T

C

0.8 J/T

D

0.6 J/T

Text Solution

Verified by Experts

The correct Answer is:
A
`tau=mB sin theta`
`:. M =tau/(B sin theta) = 0.032/(0.16xx sin 30^(@))`
`=0.4` J/T or `Am^(2)`
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