QJEEM23Ph4209: JEE Main 2023 Physics - Class 12 JEEM23Ph4209 Solution: The equivalent capacitance of the combination shown is :

Capacitors numbered (3) and (4) are short circuit as their both plates are connected to terminal B which makes the potential difference across both to be zero. The equivalent circuit is as shown :

Hence $C_{A B}=2 C$ as capacitors numbered (1) and (2) are connected in parallel.