Question

A square coil of side a carries a current I. The magnetic field at the centre of the coil is(a) $\frac{\mu_{0}I}{a\pi}$(b) $\frac{\sqrt{2}\mu_{0}I}{a\pi}$(c) $\frac{\mu_{0}I}{\sqrt{2}a\pi}$(d) $\frac{2\sqrt{2}\mu_{0}I}{a\pi}$

Answer 1

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