Question

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`

Answer 1

Correct Answer - 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,