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NEET 1997 (AIPMT) · Ohm's Law, Resistivity & Temperature

Ohm's Law, Resistivity & Temperature question from NEET 1997 (AIPMT)

Q75NEET 1997 · AIPMTEasy

Ohm's Law, Resistivity & Temperature

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

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Answer: (a)

Resistance $\dfrac{dV}{dI}$ is negative where current falls as voltage rises (negative slope of the $I$ – $V$ graph).
Along CD the curve goes down as $V$ increases; AB and DE rise and BC is around the peak.
So the answer is (a) $CD$ .

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