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Question: The amplification factor of a triode is 20. If the grid potential is reduced by 0.2 volt then to kee...

The amplification factor of a triode is 20. If the grid potential is reduced by 0.2 volt then to keep the plate current constant its plate voltage is to be increased by.

A

10 volt

B

4 volt

C

40 volt

D

100 volt

Answer

4 volt

Explanation

Solution

μ=−ΔVpΔVG⇒ΔVp=−μΔVG=−20×(−0.2)\mu = - \frac{\Delta V_{p}}{\Delta V_{G}} \Rightarrow \Delta V_{p} = - \mu\Delta V_{G} = - 20 \times ( - 0.2) = 4V.