The amplification factor of a triode is $20.$ Its plate resistance is $10$ kilo ohms. Mutual conductance is
A$2 \times 10^5 mho$
B$2 \times 10^4 mho$
C$500\ mho$
D$2 \times 10^{-3} mho$
[MNR 1992; Orissa JEE 2005]
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D$2 \times 10^{-3} mho$
Using $\mu=r_p \times g_m \Rightarrow g_m=\frac{20}{10 \times 10^3}=2 \times 10^{-3}$.
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In the circuit of a triode valve, there is no change in the plate current, when the plate potential is increased from $200$ volt to $220$ volt and the grid potential is decreased from $-0.5$ volt to $-1.3$ volt. The amplification factor of this valve is