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Question

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
127064_dbdf5e6cbe854b41be71dd018a8d529a.png
  1. C is increased
  2. C is reduced
  3. R is reduced
  4. R is increased

A
R is reduced
B
R is increased
C
C is reduced
D
C is increased
Solution
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Current in the C-R circuit is I=I0et/CR

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127064_dbdf5e6cbe854b41be71dd018a8d529a.png
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