Question

Figure shows three concentric thin conducting spherical shells A, B and C of radii R, 2R and 3R.
The shell B is earthed, A and C are given charges q, 2q respectively. Then the charges appearing
on the surfaces of
Choose correct option
0,-9
I) Inner surface of A and B are
29
9.
3
II) Outer surface of A & C are
79
3
III) Net charge on B is​

Answer 1

III option is the correct answer according to me.