Consider a neutral conducting sphere. A positive point charge is placed outside the sphere. Then the net charge on the sphere is :

Two small conductors $A$ and $B$ are given charges $q_1$ and $q_2$ respectively. Now they are placed inside a hollow metallic conductor ($C$) carrying a charge $Q.$ If all the three conductors $A, B$ and $C$ are connected by conducting wires as shown, the charges on $A, B$ and $C$ will be respectively:

If $g_E$ and $g_M$ are the accelerations due to gravity on the surfaces of the Earth and the Moon respectively and if Millikan's oil drop experiment could be performed on the two surfaces, one will find the ratio $\frac{\text{electronic }\text{charge }\text{on }\text{the }\text{moon }}{\text{electronic }\text{charge }\text{on }\text{the }\text{earth }}$  to be