Question

Three concentric spherical shells have radii a, b and c (a < b < c) and have surface charge densities σ - σ and σ respectively. If V_A V_B and V_C denote the potentials of the three shells, then, for c = a +b. we have

(a) V_C = V_B ≠ V_A

(b) V_C  ≠  V_B ≠ V_A

(c) V_C =  V_B ≠ V_A

(d) V_C = V_A ≠ V_B 

Answer 1

Correct option (d) V_C = V_A ≠ V_B 

Explanation:

Given c =a+b.

If a = a, b = 2a and c = 3a for example, as c > b > a,