Question

A triode valve has an anode resistance of 20,000 and an amplification factor of 20. The mutual conductance is:

• A. \( 10^{-2} \, \text{mho} \)
• B. \( 10^{-3} \, \text{mho} \)
• C. \( 10^3 \, \text{mho} \)
• D. \( 10^2 \, \text{mho} \)

Hint:

Mutual conductance \( g_m \) is inversely proportional to the anode resistance and directly related to the amplification factor.

Answer 1

The Correct Option is B

The mutual conductance \( g_m \) is given by the formula: \[ g_m = \frac{\mu}{R_a} \] Where:
- \( \mu \) is the amplification factor,
- \( R_a \) is the anode resistance. Substituting the values: \[ g_m = \frac{20}{20,000} = 10^{-3} \, \text{mho} \]