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A bar magnet of magnetic moment 20 Am^(2...

A bar magnet of magnetic moment `20 Am^(2)` is divided into two equal parts by cuting it along its axis. The magnetic moment of each part will be

A

`5 am^(2)`

B

`10 am^(2)`

C

`20 Am^(2)`

D

`15 Am^(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
When it is divided into two equal parts by cuting it along the axis, the pole strength of each part becomes `m/2` but the magnetic length is not changed.
`:. M=mxx2l and M'=m/2xx2l=M/2`
`:.` Magnetic moment of each part
`=M/2 =20/2=10 Am^(2)`
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