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

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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