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A spheres carrying charge 0.01C is kept ...

A spheres carrying charge `0.01C` is kept at rest without falling down ,touching a wall by applying an electric filed `100N//C`.If the coefficient of friction between the sphere and the wall is `0.2` the weight of the sphere is

A

`4N`

B

`2N`

C

`20N`

D

`0.2N`

Text Solution

Verified by Experts

The correct Answer is:
4
`F=(Qq)/(4piepsilon_(0))(x)/(R^(3))=-kx` and `T=2pisqrt((m)/(k))`
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