This is the graph between $i$ and $V$ and $i$, becomes zero at certain negative potential.
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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
For a triode, at $V_g=-1$ volt, the following observations were taken $V_p=75 V , I_p=2 mA , V_p=100 V , I_p=4 mA$. The value of plate resistance will be