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. The line AA’ is on a charged infinite conducting plane which is perpendicular to the plane of the paper. The plane has a surface density of charge σ and B is a ball of mass m with a like charge of magnitude q. B is connected by a string from a point on the line AA’. The tangent of the angle (θ) formed between the line AA’ and the string Answer is qsigma/epsilon mgBut why not sigma/2epsilonIts from wbjee 2015 physics Q7
If you recall that for an insulating infinite sheet of charge, we have found the electric field as σ over 2 ε0 because in the insulators, charge is distributed throughout the volume to the both sides of the surface, whereas in the case of conductors, the charge will be along one side of the surface only. Inside of the conducting medium, the electric field is always 0.
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