Question

plz answer this question of physics class 12​

Answer 1

Answer:

$- \frac{Q}{4}$

Explanation:

$F=\frac{kQ²}{4a²}+\frac{kqQ}{a²}$

for the system to be equilibrium F=0

$\frac{kQ²}{4a²}+\frac{kqQ}{a²}=0$

$q=-\frac{Q}{4}$