A thin  nonconducting  ring of radius `R` has a linear  charge  density `lambda = lambda_(0) cos
Channel: Doubtnut
Date: 2020-08-16

A thin  nonconducting  ring of radius `R` has a linear  charge  density `lambda = lambda_(0) cos  varphi`, where  `lambda_(0)` is a constant , `phi` is the azimutahl  angle. Find the magnitude  of the electric  field strength(a) at the centre of the ring ,  (b) on the axis of the ring as a function of the distance  `x` from its centre. Investegation the obtained  function at `x gt gt R`.