Two point charges (-q) and (+4q) are placed at separation 'r'. Where should a third charge be placed so that entire system of charges becomes in equilibrium?

at separation 'r' from (-q) on the extreme side of -q. at separation 'r' from (4q) on the extreme side of 4q. at separation $\frac{r}{2}$ from (-q) in between the two charges. at separation $\frac{r}{4}$ from (4q) in between the two charges.

at separation 'r' from (-q) on the extreme side of -q.

The correct answer is Option (1) → at separation 'r' from (-q) on the extreme side of -q.