Question

A metal ball has - 8 Coulomb of charge. If it receives 0.50*10^20 number of electrons, what will be the resultant charge of the ball?

Answer 1

The resultant charge of the ball:

$$Q'=Q+Ne$$

$$Q'=-8-(0.50\cdot10^{20})(1.6\cdot10^{-19})=-16\ C$$