Q. The current in a triode at anode potential $100\ V$ and grid potential $- 1.2\ V$ is $7.5\ mA$. If grid potential is changed to $- 2.2\ V,$ the current becomes $5.5\ mA.$ the value of trans conductance $(g_{m})$ will be
A) 2 $mili\ mho$
B) $3\ mili\ mho$
C) $4\ mili\ mho$
D) $0.2\ mili\ mho$
Explanation
(a) $g_{m} = \left( \frac{\mathrm{\Delta}I_{p}}{\mathrm{\Delta}V_{g}} \right)_{V_{p} = constant} = \frac{(7.5 - 5.5)}{- 1.2 - ( - 2.2)} = 2m\ mho$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.