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A bar magnet of magnetic moment 40 Am^(2...

A bar magnet of magnetic moment `40 Am^(2)` is divided into two equal parts by cutting it along its equator. The magnetic moment of each part will be

A

`10 Am^(2)`

B

`15 Am^(2)`

C

`20 Am^(2)`

D

`30 Am^(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
When the bar magnet is divided into two equal parts by cutting it along the equator, its pole strength does not change but its magnetic length becomes half.
Thus, `M=mxx2l and M'=mxxl=M/2`
`:.` Magnetic moment of each part
`=M/2=40/2=20 Am^(2)`
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