If $B_1$ is the magnetic field induction at a point on the axis of a circular coil of radius $R$ situated at a distance $R \sqrt{3}$ and $B_2$ is the magnetic field at the centre of the coil,then the ratio of $\frac{B_1}{B_2}$ is equal to
- A$\frac{1}{3}$
- B$\frac{1}{8}$
- C$\frac{1}{4}$
- D$\frac{1}{2}$
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