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The length of a magnetised steel wire is...

The length of a magnetised steel wire is l is the magnetic momemt is M. It is bent the shape of L with two sides equal. What will be the new magnetic moment?

A

`M/sqrt(2)`

B

`M/2`

C

`sqrt(2) M`

D

`2M`

Text Solution

Verified by Experts

The correct Answer is:
A

For the steel wire `M=ml`
When it is bent into L shape from the middle, the distance between the N and S poles becomes `l/sqrt(2)`.
`:.` Magnetic length `=1/sqrt(2)`
`:.` New mahnetic moment `=m xx l'`
`M'=(ml)/sqrt(2)=M/sqrt(2)`
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