One end of a 10 cm long silk thread is fixed to a large vertical surface of a xharged nonconducting
Channel: Doubtnut
Date: 12/07/2020

One end of a 10 cm long silk thread is fixed to a large vertical surface of a xharged nonconducting plate and the other end is fastened to a small ball having a mass of 10 g and charge of `4.0 xx 10^ C`. In equilibrium, the thread make an angle of `60^0` with the vertical. Find the surface charge dendity on the plate.