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A square wire of each side l carries a c...

A square wire of each side `l` carries a current `I`. The magnetic field at the mid point of the square is

A

`4sqrt2 mu_0/(4 pi) I/l`

B

`8sqrt2 mu_0/(4 pi) I/l`

C

`16sqrt2 mu_0/(4 pi) I/l`

D

`32sqrt2 mu_0/(4 pi) I/l`.

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