Semiconducting Devices Question 268

Question: If $ R _{p}=7K\Omega ,g _{m}=2.5 $ millimho, then on increasing plate voltage by $ 50V $ , how much the grid voltage is changed so that plate current remains the same

[RPET 1996]

Options:

A) - 2.86 V

B) - 4 V

C) + 4 V

D) + 2 V

Show Answer

Answer:

Correct Answer: A

Solution:

By using $ \mu =-\frac{\Delta V _{p}}{\Delta V _{g}} $

$ =r _{p}\times g _{m} $
$ \Rightarrow 7\times 10^{3}\times 2.5\times {{10}^{-3}}=-\frac{50}{\Delta V _{g}} $
$ \Rightarrow \Delta V _{g}=-2.86V $ .



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