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

0.2

0.5

0.4

Text Solution

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The correct Answer is:

(d) Torque, `tau=MB sin theta`
`rArr M=(tau)/(B sin theta)=(0.032)/(0.16xxsin 30^(@))=(0.032xx2)/(0.16xx1)=0.4J//T`

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