Question

The charge flowing across the circuit on closing the key K is equal to

• A. CV
• B. V
• C. 2CV
• D. Zero

Answer 1

Answer: (B)

V

Answer 2

When the key K is kept open the charge drawn from the source is Q = C′V

where C′ is the equivalent capacitance given by C′ = C/2

Therefore Q = (C/2)V

When the key K is closed, the capacitor 2 gets short circuited and thus the charge in that capacitor comes back to the source.
∴ Charge flowing is Q = (C/2) V