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A magnetic wire of dipole moment 4piAm^(...

A magnetic wire of dipole moment `4piAm^(2)` is bent in the form of semi-circle. The new magnetic moment is

A

M

B

`(2M)/(pi)`

C

`M//pi`

D

none of the above

Text Solution

Verified by Experts

The correct Answer is:
B
After beding , distance between poles = 2 r
Earlier distance ` = l (pi r)`
` (M)/(M) = (m xx 2r)/(m xx pir) = (2)/(pi)`
`therefore M . = M xx (2)/(pi)`
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