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

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

The number of electrons in $1.6 \, C$ charge will be

Why is a spark seen when removing synthetic clothes in the dark during winter?

The number of electrons in $1 \ C$ of charge is:

The statement that electric charge is an integral multiple of the electronic charge $e$ was experimentally proven by whom?