Question

If your body develops a charge of -13 μC (microcoulombs), how many excess electrons has it acquired?

Answer 1

The charge of one electron is equal to 1.602×10^-19 C.

-13 μC = -13×10^-6 C.

Then

$$N(e^-) = {-13×10^{-6} \over 1.602×10^{-19}} = 8.115 × 10^{13}$$

Answer: 8.115×10¹³ excess electrons.