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-