Answer:
Step-by-step explanation:
At the center of the conductor lies the sphere of radius r which contains charge 1C . The sphere is a conductor so all its charge will lie on its surface . Hence on surface c charge lying = 1 C .
Charge on surface c will induce a charge - 1C on inner surface of hollow outer conductor so charge on inner surface b of the hollow conductor will b - 1 C .
Here it is to be noted that the charge carried by hollow conductor will lie on its surface . so on surface a of hollow conductor , its charge 2C will lie . Apart from it a charge + 1 C will also be induced on it due to charge on the inner sphere . Hence total charge on surface a will be 2C +1C = +3C .