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For a uniformly charged ring of radius $R$, the electric field on its axis has the largest magnitude at a distance $h$ from its centre. Then value of $h$ is:
(1) $\frac{R}{\sqrt{5}}$
(2) $\frac{R}{\sqrt{2}}$
(3) $R$
(4) $R\sqrt{2}$
$E = \frac{kQh}{(R^2 + h^2)^{3/2}}$. For maximum, $\frac{dE}{dh} = 0$: $h = \frac{R}{\sqrt{2}}$.
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