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

Options

A. P
B. Q
C. R
D. S

Answer

B

Explanation

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).