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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 shows the variation of 1n 1 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 point `I=E/Re^(-t/(RC))` ,Taking both sides, `log I=log(E/R)-t/(RC)`
Then R is doubled slope of curve decreases Also at t=0,the current will be less. Graph Q represents the best Hence ,the correct option is (B).
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