Question

In a diode, when there is a saturation current, the plate resistance will be

• A. data insufficient
• B. zero
• C. some finite quantity
• D. infinite

Answer 1

The correct option is D infinite

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 infinte.