A circular coil of wire of radius $r$ has $n$ turns and carries a current $I$. The magnetic induction $B$ at a point on the axis of the coil at a distance $\sqrt{3} r$ from its centre is

Question

$\frac{\mu_0 n I}{8 r}$

$\frac{\mu_0 n I}{16 r}$

$\frac{\mu_0 n I}{4 r}$

$\frac{\mu_0 n I}{32 r}$

Solution

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