# NEET Physics Moving Charges and Magnetism Questions Solved

The magnetic field at the centre of coil of n turns, bent in the form of a square of side 2 l , carrying current i, is

(a)  $\frac{\sqrt{2}{\mathrm{\mu }}_{0}\mathrm{ni}}{\mathrm{\pi l}}$                               (b)  $\frac{\sqrt{2}{\mathrm{\mu }}_{0}\mathrm{ni}}{2\mathrm{\pi l}}$

(c)  $\frac{\sqrt{2}{\mathrm{\mu }}_{0}\mathrm{ni}}{4\mathrm{\pi l}}$                                (d)  $\frac{2{\mathrm{\mu }}_{0}\mathrm{ni}}{\mathrm{\pi l}}$

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