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From the graph between current (I) and voltage (V) is shown. Identify the portion corresponding to negative resistance

Asked in CBSE AIPMT 1997 · Limitations of Ohm's law

Figure: Limitations of Ohm's law
Answer: (1) CD

Step-by-step solution

Idea: dynamic resistance is (Δ V)/(Δ I); it is negative where the current falls as the voltage rises.

Along CD the voltage increases while the current decreases.

So Δ V/Δ I < 0 on CD: negative resistance.

Why the other options are wrong

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