1.

The magnetic field at the centre of coil of n turns, bent in the form of a square of side 2l , carrying current i, is             [AMU (Engg.) 1999]

A.    \[\frac{\sqrt{2}{{\mu }_{0}}nI}{\pi l}\]
B.    \[\frac{\sqrt{2}{{\mu }_{0}}nI}{2\pi l}\]
C.    \[\frac{\sqrt{2}{{\mu }_{0}}nI}{4\pi l}\]     
D.    \[\frac{2{{\mu }_{0}}nI}{\pi l}\]
Answer» B.    \[\frac{\sqrt{2}{{\mu }_{0}}nI}{2\pi l}\]


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