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# A thin fixed ring of radius 1 m has a positive charge 1×10−5C uniformly distributed over it. A particle of mass 0.9gm having a negative charge of 1×10−6C is placed on the axis at a distance of 1cm from the centre of the ring. Assuming that the oscillations has small amplitude, the time period of oscillations is:0.23s0.39s0.49s0.63s

A
0.49s
B
0.23s
C
0.39s
D
0.63s
Solution
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#### We know E on the axis of the ring is:

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