Question

why can one ignore quantisation of electric charge when dealing with macroscopic charges.?

Answer 1

At macroscopic level, quantisation of charge is neglected because of the continuous charge distribution in macroscopic objects. Quantization is applicable to point charges only where we can easily determine the charge by using an equation
q=n( +-e) where n is an integral.

Answer 2

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1. In macroscopic or large scale charges, the charges used are huge as compared to the magnitude of electric charge.
2. Hence, quantization of electric charge is of no use on macroscopic scale.
3. Therefore, it is ignored and it is considered that electric charge is continuous.

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