First slide

Electric field

Question

A charge of $4 \times 10^{- 9} C$ is uniformly distributed over the surface of ring shape conductor of radius $0.3 m$ . Calculate the intensity of electric field at a point on the axis of the ring at a distance of
$0.4 m$ from the plane of the conductor ____ $V / m$

Moderate

Solution

$E_{R} = \frac{K . q r}{{(R^{2} + r^{2})}^{\frac{3}{2}}} = \frac{9 \times 10^{9} \times 4 \times 10^{- 9} \times 0.4}{{({(0.3)}^{2} + {(0.4)}^{2})}^{\frac{3}{2}}} = 115.2 \frac{V}{m}$

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