Explanation
Outside the charged sphere, (for equal distances from centre) if electric fields at two points arc same then both points must be equipotential points.
Option (a) shows lines of force starting from one positive charge and terminating at another. Option (b) has one line of force making closed loop. Option (d) shows all lines making closed loops. All these are not correct. Only option (c) is correct.
Electric field is perpendicular to the equipotential surface and is zero every where inside the metal.
If the charges are arranged according to the option (d), the electric fields due toP and S and due to Q and T add to zero, while due to U and R will be added up.
If the value of C is chosen as 4 µF, the equivalent capacity across every part of the section will be 4µF.
The ±q charges appearing on the inner surfaces of A, are bound charges. As B is unchanged initially, as it is isolated, the charges on A will not be affected on closing the switch S. No charge will flow in to B.
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