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A capacitor of capacity C is charged to ...

A capacitor of capacity `C` is charged to a steady potential difference `V` and connected in series with an opne key and a pure resistor 'R'. At time `t = 0`, the key si closed. If `I =` current at time `t`, a plot of `log I` against 't' is as shown in `(1)` in the graph. Later one of the parametrs i.e. `V,R` or `C` is charged keeping the other two constant, and graph `(2)` is recored. then-

A

`C` is reduced

B

`C` is increased

C

`R` is reduced

D

`R` is increased

Text Solution

Verified by Experts

The correct Answer is:
B
`I = (V)/(R ) e^(-t//RC)`
`logI =- (t)/(RC) +log (V)/(R )`

Since intercept is same so `R` a `V` is not charged slope decreases so `C` increases.
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