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A conducting wire of 2m length is used t...

A conducting wire of 2m length is used to form a circular loop. If it carries a current of 2A, its magnetic moment will be ______ `Am^(2)`.

A

`pi`

B

`2/pi`

C

`2pi`

D

`4pi`

Text Solution

Verified by Experts

The correct Answer is:
B
`l=2pir`
`-r=l/(2pi)=2/(2pi)=1/pi`
`thereforem=IA`
= `Ixxpir^(2)`
= `2xxpixx1/pi^(2)`
= `2/piAm^(2)`
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