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The figure represents variation of triode parameter ( $\mu$ or $r$ or $g$ ) with the plate current. The correct variation of $\mu$ and $r$ are given, respectively by the curves
Different voltages are applied across a $P-N$ junction and the currents are measured for each value. Which of the following graphs is obtained between voltage and current
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 $(g)$ will be