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A straight wire carrying current I is tu...

A straight wire carrying 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

`(4 pi)/M`

B

`(M pi)/(4 I)`

C

`sqrt [(4 pi M)/I]`

D

`sqrt [(4 pi I)/M]`

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