Question

The sum of two charges is equal to zero. What does it signify.

Answer 1

This means two eqal and opposite charges are present in the system.
ex... +4C and -4C , +10C and -10 C etc.

Answer 2

$\huge \bf \green {answer}$
since the measure of charge is same on the both equal amount of charge with the opposite nature will cancel out can other hands the total sum of charge on two bodies is zero
$\bf \pink{hope \: it \: help \: u}$