The grid voltage of any triode valve is changed from $-1$ volt to $-3$ volt and the mutual conductance is $3 \times 10^{-4} mho$. The change in plate circuit current will be
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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