Physics - Wave on String Question with Solution | TestHub

Key Idea Change in current at saturation is zero. We know that plate resistance is given by $$r_p=\frac{\delta V}{\delta I}$$ where $\delta V$ is change in voltage and $\delta I$ is change in current. Also, at saturation change in current is zero. $\therefore$ $$r_p=\frac{\delta V}{0}=\infty$$ Hence, plate resistance will be infinite.