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  4. Shown below is a graph of current versus applied voltage for a diode. Approximately, what is the resistance of the diode for an applied voltage of −1 V ? <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-sb67tipvr6godfgk.jpg />

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Q. Shown below is a graph of current versus applied voltage for a diode. Approximately, what is the resistance of the diode for an applied voltage of $−1 V$ ?
Question

NTA AbhyasNTA Abhyas 2022

Solution:

The graph of current versus applied voltage for diode
Solution
In this case, at $−1 V$ , current in the circuit is zero.
Hence, according to Ohm's law,
$R=\frac{V}{I}=-\frac{1}{0}=\in fty$