The charge on an $\alpha$-particle is:

Why can we say that the charge of any body is always an integral multiple of $e$?

Faraday's law of electrolysis indirectly shows:

Discuss the types of electric charges by rubbing appropriate non-conductors. Which scientist gave their names?

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

What is called the polarity of electric charge?