The radius of a circular coil is $R$ and it carries a current of $I$ ampere. The intensity of the magnetic field at a distance $x$ on the axis from the centre $(x >> R)$ will be:
- A$B = \frac{\mu_0 I R^2}{2 x^2}$
- B$B = \frac{\mu_0 I R^2}{2 x^3}$
- C$B = \frac{\mu_0 I R}{2 x^2}$
- D$B = \frac{\mu_0 I R}{2 x^3}$
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