Q. In a triode valve the amplification factor is 20 and mutual conductance is $10^{- 3}\ mho$. The plate resistance is
A) $2 \times 10^{3}\ \Omega$
B) $4 \times 10^{3}\ \Omega$
C) $2 \times 10^{4}\ \Omega$
D) $2 \times 10^{5}\ \Omega$
Explanation
(c) $\mu = r_{p} \times g_{m} \Rightarrow r_{p} = \frac{20}{10^{- 3}} = 2 \times 10^{4}\Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.