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A capacitor is charged using an external...

A capacitor is charged using an external battery with a resistance x in series. The dashed line showns the variation of In I with respect to time. If the resistance is changed to 2x, the new graph will be

A

`P`

B

`Q`

C

`R`

D

`S`

Text Solution

Verified by Experts

The correct Answer is:
B
Charging current `I=(E)/(R)e^((t)/(RC))`
Taking log bothh sides `logI=((E)/(R))-(t)/(RC)`
When R is doubled slope of curve decreases also at `t=0` the current will be less. Graph Q represents the best,
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