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A square frame of side l carries a curre...

A square frame of side l carries a current I and produces a magnetic field B at centre. If the same current is passed through a circular coil having the same perimeter as the square frame, it produces a field B' at its centre. Then `(B)/(B')` will be

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The correct Answer is:
`(pi^(2))/(8 sqrt(2))`
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