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A thin fixed ring of radius 1 metre has a positive charge 1×10^-5C uniformly distributed over it. A particle of mass 0.9gm and having a negative charge of 1×10^-6C is placed on the axis at a distance of 1 cm from the centre of the ring. Assuming that the oscillations have small amplitude, the time period of oscillations is

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0.39s

0.63s

0.23s

0.49 s

answer is D.

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Detailed Solution

$F = \frac{Qq}{4 π \in_{0}} \frac{x}{R^{3}} = - kx and T = 2 π \sqrt{\frac{m}{k}}$

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