Question

Why can one ignore quantisation of electric charge when dealing with macroscopic i.e., large scale charges?

Answer 1

When compared to an electron's charge, e = 1.6 x 10^-19C, charges at the macroscopic level are huge. There are about 10¹³ electronic charges in just 1 nC of charge. Therefore, the quantization of electric charge is irrelevant at this high scale since charge might take on a continuous value instead of a discrete integral multiple of e.