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A straight wire carring current I is tur...

A straight wire carring current I is turned into a circular loop. If the magnitude of magnetic moment associated with it in M.K.S. unit is M, the length of wire will be

A

`4piiM`

B

`sqrt((4piM)/i)`

C

`sqrt((4pii)/M)`

D

`(Mpi)/(4i)`

Text Solution

Verified by Experts

The correct Answer is:
B
Megnetic moment of circular loop carrying current
`M=IA=I(piR^(2))=Ipi(L/(2pi))^(2)=(IL^(2))/(4pi) implies L=sqrt((4piM)/I)`
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