$A$ 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
- A$\frac{\mu_0 n I}{8 r}$
- B$\frac{\mu_0 n I}{16 r}$
- C$\frac{\mu_0 n I}{4 r}$
- D$\frac{\mu_0 n I}{32 r}$
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