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Question

Two identical capacitors each of capacitance C are charged to the same potential V and are connected in two circuits (i) and (ii) at t=0 as shown. The charged on the capacitor at t=CR are :

661327_476445119f4844e08d919e0208304289.png

A
CVe,CVe
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B
CV,CV
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C
VCe,VC
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D
VC,VCe
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Solution

The correct option is C VCe,VC
For the circuit (i), diode has higher voltage at p-side, so it is forward-biased and acts as short.
Thus capacitor discharge through capacitor.
q=q0et/RC=CVet/RC
at t=RC,q=CVeCR/CR=CV/e

For the circuit (ii), diode has higher voltage on the n-side, so it is reversed-biased and acts as open circuit.
So the capacitor is isolated and its charge stays the same.
So q=CV
Option C is correct.

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