Explain,"Quantization of charge".

An unit of charge is :

In the following configuration of charges Force on charges q_2 by q_1 is given by

The charge on any body can be expressed as an integral multiple of basic unit of charge, i.e. charge on one electron. This phenomena is called

Explain the meaning of the statement electric charge of a body is quantised"

When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain, how this observation is consistent with the law of conservation of charge?

State the principle of superposition of charges. Obtain an expression for force on one charge due to all other charges around it.

Discuss different characteristics of charge. What do you mean by conservation of charge?