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The magnetised wire of moment M and leng...

The magnetised wire of moment M and length I is bent in the form os semicircle of radius r. Then, its magnetic moment is

A

`2m/pi`

B

`2M`

C

`M/pi`

D

`Zero`

Text Solution

Verified by Experts

The correct Answer is:
A
If a magnet is bent at an angle theta in the form of arc, then
magnetic moment `M^(1)=(2M"sin"(theta/2))/(theta )`
For a semicircle, `theta=180^(@)(pi)`
`M^(1)=2M/pi`
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