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The capacitors in the circuit in the figure below are identical and initially uncharged. Switch S1 is closed while switch S2 remains open. After sometime, switch S1 is opened and switch S2 closed. Determine the final reading of the voltmeter, V.

Answer Text:
Q = CV=3C
When S2 is closed the charge is shared, i.e
Q/2 = CV
#V = Q/(2C)#
#V = (3C)/(2C) =1.5V#