Question

Which value of charge is not possible and why?

A. 1. 6×10^-18 C
B. 3. 2×10^-17C
C. 3. 2×10^-21C
D. 1. 6×10^-22C​

Answer 1

The value of charge that is not possible is C. 3.2x10^-21C.

This is because the elementary charge (charge of a proton or electron) is 1.6x10^-19C. Any charge that is not an integer multiple of this value is not possible.

Option A is 10 times the elementary charge, option B is 20 times the elementary charge, and option D is 1/10th of the elementary charge, which are all possible.