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A bar magnet of magnetic mament 3 Am^(2...

A bar magnet of magnetic mament `3 Am^(2)` is placed in a uniform magnetic induction of `2xx10^(-2)` T experiences a troque of `25xx10^(-6)` N-m what is its poles strenght if the imagnetic length of the magnet is 5 cm ?

A

2 A-m

B

5 a-m

C

`5xx10^(-2)`A-m

D

`2xx10^(-2)` A-m

Text Solution

Verified by Experts

The correct Answer is:
D
`tau =MB sin theta "but" because M=mxx2l`
`tau =m(2l) B sin theta`
`m=2xx10^(-2) Am`
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