An infineltly  long cylindrical  surface  density  `sigma = sigma_(0) cos varphi`. Where `varphi
Channel: Doubtnut
Date: 2020-08-30

An infineltly  long cylindrical  surface  density  `sigma = sigma_(0) cos varphi`. Where `varphi` is the polar angle of the cylindrical coordinate  system whose `z`  axis  coincides with the axis of the given surface. Find the magnitude  and direction  of the electric fiels strength vector  on the `z` axis.