There are four concentric shells A,B, C and D of radii `a,2a,3a` and `4a` respectively. Shells B and D are given charges `+q` and `-q` respectively. Shell C is now earthed. The potential difference `V_A-V_C` is `k=(1/(4piepsilon_0))`

Four concentric conducting spherical shells A, B, C and D of radii a, 2a, 3a and 4a respectively. Shell B and D are given charges q and -q respectively. If shell C is grounded then potential difference (VA — VC) is

Four concentric conducting spherical shells P, Q, R and S of radii a, 2a, 3a and 4a respectively. Shell P and S are given charges q and -q respectively. If shell R is grounded then potential difference (VP — VR) is (where V, and VR are potential at surfaces of P and R respectively)

Figure shows three concentric thin spherical shells A, B and C of radii a, b, and c. The shells A and C are given charge q and -q, respectively, and shell B is earthed. Then,

Figure shows three concentric thin spherical shells A, B and C of radii a, b and c respectively. The shells A and C are given charges q and -q respectively and the shell B is earthed. Find the charges appearing on the surfaces of B and C.