There are two concentric metal shells of radii `r_(1)` and `r_(2) ( gt r_(1))`. If initially, the outer shell has a charge q and the inner shell is having zero charge and then inner shell is grounded. Find :
(i) Charge on the inner surface of outer shell.
(ii) Final charges on each sphere.
(iii) Charge flown through wire in the ground.

Explanation

(i) `((r_(1))/(r_(2)))q`
(ii) Charge on inner shell `=-((r_(1))/(r_(2)))q` and charge on the outer shell = q
(iii) Charge flown in to the earth `=-q((r_(1))/(r_(2)))`