Two wires of same length are made into a...

Two wires of same length are made into a circle and square respectively. Currents are passed in then such that their magnetic moments are equal. Then the ratio of the magnetic field at their respective centres (circle:square) is

`( sqrt(2) pi ^3)/( 32)`

`( sqrt(2)pi^3)/( 64)`

`( sqrt(2) pi^3)/( 16)`

`( sqrt(2) pi^3)/( 8)`

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