Single Choice

Due to S.C.R in vacuum tube

A$$I_p \rightarrow $$Decreases
Correct Answer
B$$I_p \rightarrow $$Increases
C$$V_p \rightarrow $$Increases
D$$V_g \rightarrow $$Increases

Solution

In SCR (Space charge region) electrons collect around the plate, this cloud decreases the emission of electrons from the cathode, hence plate current decreases.

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