Two identical positive charges \( Q \) each are fixed at a distance of '\( 2a \)' apart from each other. Another point charge \( q_0 \) with mass ‘\( m \)’ is placed at midpoint between two fixed charges. For a small displacement along the line joining the fixed charges, the charge \( q_0 \) executes SHM. The time period of oscillation of charge \( q_0 \) will be:
