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One end of a 10 cm long silk thread is f...

One end of a 10 cm long silk thread is fixed to a large vertical surface of a charged non-conducting plate and the other end is fastened to a small ball of mass 10 g and charge of `4 xx 10^(-6) C`. In equilibrium, thread makes an angle of `60^(o)` with the vertical.
(a) Find the tension in the string in equilibrium.
(b) Suppose the ball is slightly pushed aside and released. Find the time period of the small oscillations.
(Use `sigma=7.5xx10^(-7) C/m^2`)

A

0.45 sec

B

0.32 sec

C

0.1sec

D

0.52sec

Text Solution

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The correct Answer is:
A
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