Question 11.C-A.66: A graph of vacuum diode current I, is plotted against the an...

Pearson IIT Foundation Series Physics Class 10

A graph of vacuum diode current I, is plotted against the anode voltage, $V_{P}$ for two different temperatures $T_{1}$ and $T_{2} (T_{2} > T_{1})$ of the cathode, as shown in the figure below.

(1) For the same anode voltage, (called plate voltage) why is the current more when the cathode temperature changes from $T_{1}$ to $T_{2}$ ?

(2) In the part CD of the graph, why change in $V_{p}$ has no effect on $I_{P}$ ?

(3) What is the plate current when plate voltage is zero? At what plate voltage the plate current is zero?

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