A circular coil of average radius 6 cm has 20 turns. A current 1.0 A is set up through it. Find the magnetic induction at
(ii) At a point on its axis, 8 cm away from the centre

Explanation

To find the magnetic induction (magnetic field) at a point on the axis of a circular coil, we can use the formula for the magnetic field due to a circular coil at a distance along its axis. The formula is given by:

\[ B = \frac{\mu_0 N I}{2} \cdot \frac{R^2}{(R^2 + x^2)^{3/2}} \]

Where:
- \(B\) = magnetic field at the point on the axis
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