A capacitor of capacitance C is charged to a steady potential difference V and connected in series with an open key and a resistor R. At time t=0, the key is closed. A plot of log I against t is as shown in the graph (1), where,I= current at time t. Later, one of the parameters, i.e., V,R or C is changed keeping the other two constant, and the graph (2) is recorded. Then
C is increased
C is reduced
R is reduced
R is increased
A
R is reduced
B
R is increased
C
C is reduced
D
C is increased
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Solution
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Current in the C-R circuit is I=I0e−t/CR
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