A circular current carrying coil has a radius R. The distance from the centre of the coil on the axis where the magnetic induction will be $\frac{1}{8}\mathrm{th}$ to its value at the centre of the coil, is

(a) $\frac{\mathrm{R}}{\sqrt{3}}$                       (b)  $\mathrm{R}\sqrt{3}$

(c) $2\sqrt{3}\mathrm{R}$                     (d) $\frac{2}{\sqrt{3}}\mathrm{R}$

(b)

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