question_answer

Assertion (A) A  spherical  equipotential surface is not possible for a point charge. Reason (R) A spherical equipotential surface is possible inside a spherical capacitor. Each of these questions contains two statements. Assertion and Reason. Each of these questions also has four alternative choices, only one of-which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.

A) If both Assertion and Reason are true and Reason is correct explanation of Assertion.

B) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

C) If Assertion is true but Reason is false.

D) If both Assertion and Reason are false.

Correct Answer: D

Solution :

Consider a symmetrical spherical surface around the point charge at a distance a. Potential at each point of this spherical surface is \[({{f}_{nn}})\]  constant. This surface acts as an equipotential surface. Consider a isolated spherical capacitor of radius b. Potential of each point on the surface \[{{f}_{pp}}<{{f}_{pn}}={{f}_{nn}}\] constant.