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Two copper wires A and B of the same len...

Two copper wires A and B of the same length and samw diameter are shpaed into a square and a circle respectively. If the wires in these forms carry the same current, then the ratio of the magnetic moment of A to that of -B is

A

`pi:4`

B

`pi:2`

C

`2:pi`

D

`4:pi`

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