Question

find the capacitance if inner sphere is earthed?​

Answer 1

Explanation:

Spherical capacitor when inner sphere is earthed

The charge + Q1 on the inner surface of outer sphere B will induce a charge of -Q1 coulombs on the outer surface of inner sphere A and + Q1 coulombs on the inner surface of sphere A, which will go to earth.

Answer 2

Answer:

If a positive charge of Q coulombs is given to the outer sphere B, it will distribute itself over both its inner and outer surfaces.

Let the charges of Q1 and Q2 coulombs be at the inner and outer surfaces respectively of sphere B where Q=Q1+Q2 Q = Q 1 + Q 2