(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?

Explanation

### Solution:

(a) The statement "electric charge of a body is quantised" means that electric charge can only exist in discrete amounts rather than in a continuous range. This implies that the total electric charge \( Q \) on a body can be expressed as an integral multiple of the elementary charge \( e \), which is the charge of a single electron (approximately \( 1.6 \times 10^{-19} \) coulombs). Therefore, the charge can be represented as:

\[ Q = n \cdot e \]

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