Question

The saturation current in a triode valve can be changed by changing
(a) the grid voltage
(b) the plate voltage
(c) the separation between the grid and the cathode
(d) the temperature of the cathode

Answer 1

Answer:

(d) the temperature of the cathode

Answer 2

The saturation current in a triode valve can be changed by changing  the grid voltage.

Explanation:

Option (a) is correct

• Because the triode significance includes of a space charging area close to the cathode, a grid voltage affects this space charge area. When the grid voltage is negative, the electrons moving from the cathode are repelled and the current is reduced.
• If such a voltage is positive it makes the electrons travel in the direction of the anode. This voltage is therefore more effective in adjusting the current at the surface.
• Because in the triode the saturated current is the full value of the surface current, the grid voltage effectively regulates the saturated current throughout the triode valve. A grid voltage is more negative, and the amount of saturated current is less.

To know more about  saturation current, visit:

In a plot of photo electric current v/s anode potential how does

(a) the saturation current varies with anode potential for incident radiations of different frequencies but same intensity.

(b) the stopping potential varies for different intensities but same frequency of incident radiation

(c) photoelectric current varies for different intensities but same frequency of incident radiation?

justify your answer in each case.

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Why saturation current does not vary with frequency in photoelectric effect ?

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