Electronic Devices Question 188
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 $ .
