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A magnet of magnetic moment 2JT^(-1) is ...

A magnet of magnetic moment `2JT^(-1)` is aligned in the direction of magnetic field of `0.1T`. What is the net work done to bring the magnet normal to the magnrtic field?

A

0.1 J

B

0.2 J

C

1 J

D

2 J

Text Solution

Verified by Experts

The correct Answer is:
B
`W=MB [cos theta_(1)-cos theta_(2)]`
`=2xx0.1 [cos 0^(@)-cos 90^(@)]=0.2xx[1-0]=0.2 J`
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