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Question:

In the following circuit, the switch S is closed at t=0. The charge on the capacitor C1 as a function of time will be given by (Ceq = C1C2/(C1+C2)).

C2E[1-exp(-t/RC2)]

CeqE exp(-t/RCeq)

C1E[1-exp(-tR/C1)]

CeqE[1-exp(-t/RCeq)]

Solution:

The correct option is A
CeqE[1-exp(-t/RCeq)]
The formula for charge varying with time in a charging capacitor is Q = E × Ceq(1 - exp(-t/R × Ceq))
as the equivalent capacitor is given in the question. So the correct option which matches is A.