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 at a point on the axis of a circular coil, we can use the formula for the magnetic field \( B \) at a distance \( z \) from the center of a circular coil with \( N \) turns, carrying a current \( I \):

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

Where:
- \( \mu_0 \) is the permeability of free space, \( \mu_0 = 4\pi \times 10^{-7} \, \text{T m/A} \)
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