When a glass rod is rubbed with silk,it

What is the reason behind the production of electric force between two particles?

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

If a body contains $10^{24}$ electrons and $10^{26}$ protons,the total amount of charge on the body is . . . . . . $C$.

$(a)$ Explain the meaning of the statement 'electric charge of a body is quantised'.
$(b)$ Why can one ignore quantisation of electric charge when dealing with macroscopic, i.e., large-scale charges?

The charge on $500\,cc$ of water due to protons will be