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One end of a 10 cm long skill thread is ...

One end of a 10 cm long skill thread is fixed to a large vertical surface of a charged nonconducting plate and the other end ise fastened to a small ball having a mass of 10 g and a charge of `4.0 xx 10^(-6)C`. In equilibrium, the thread makes an angle of `60^(@)` with the vertical.
Find the surface charge density on the plate.

A

`6.5 xx 10^(-8) C//m^(2)`

B

`7.5 xx 10^(-7) C//cm^(2)`

C

`7.5 xx 10^(-9) C//m^(2)`

D

`9.5 xx 10^(-6) C//cm^(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
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