JEE Advanced Physics 2013 Paper 1 #15 (#17) Capacitors

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In the circuit shown, there are two parallel plate capacitors each of capacitance C. The switch S1 is pressed first to fully charge capacitor C1 and then released. Switch S2 is then pressed to charge capacitor C2. After some time, S2 is released and then S3 is pressed. After some time:
A) The charge on the upper plate of C1 is 2CV0.
B) The charge on the upper plate of C1 is CV0.
C) The charge on the upper plate of C2 is 0.
D) The charge on the upper plate of C2 is -CV0.

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Thank u sir, I'm from Sri Lanka..💕💕💕