One metallic sphere $A$ is given a positive charge,whereas another identical metallic sphere $B$ of exactly the same mass as $A$ is given an equal amount of negative charge. Then:

The nature of binding for a crystal with alternate and evenly spaced positive and negative ions is

What is electrostatic induction?

Find the change in mass of a body if it is given a $+2 \, C$ charge.

There are two metallic spheres of same radii but one is solid and the other is hollow, then

We have three identical metallic spheres $A, B$ and $C$. $A$ is given a charge $Q$,and $B$ and $C$ are uncharged. The following processes of touching of two spheres are carried out in succession. Each process is carried out with sufficient time.
$(i)$ $A$ and $B$
$(ii)$ $B$ and $C$
$(iii)$ $C$ and $A$
$(iv)$ $A$ and $B$
$(v)$ $B$ and $C$
The final charges on the spheres are