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.

One end of a 10 cm long skill thread is fixed to a large vertical surf

1.	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.
Answer» `6.5 xx 10^(-8) C//m^(2)` `7.5 xx 10^(-7) C//cm^(2)` `7.5 xx 10^(-9) C//m^(2)` `9.5 xx 10^(-6) C//cm^(2)` ANSWER :C

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