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A square loop of length L is made of wir...

A square loop of length L is made of wire of uniform cross-section carrying current l as shown in figure then magnetic field at centre of square is

A

Zero

B

`(2sqrt2mu_0l)/(piL)`

C

`(9mu_0l)/(2piL)`

D

`(sqrt2mu_0l)/(piL)`

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