A charged particle having some mass is resting in equilibrium at a ...

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A charged particle having some mass is resting in equilibrium at a height \( \mathrm{H} \) above the centre of a uniformly charged non-conducting horizontal ring of radius \( \mathrm{R} \). The force of gravity acts downwards. The equilibrium
\( \mathrm{P} \) of the particle will be stable
(A) for all values of \( \mathrm{H} \)
(B) only if \( \mathrm{H}\frac{\mathrm{R}}{\sqrt{2}} \)
(C) only if \( \mathrm{H}\frac{\mathrm{R}}{\sqrt{2}} \)
(D) only if \( \mathrm{H}=\frac{\mathrm{R}}{\sqrt{2}} \)
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