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Ohm's Law in Scalar Form

From the grap...

Question

From the graph between current i & voltage V shown, identify the portion corresponding to negative resistance

A

DE

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B

CD

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C

BC

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D

AB

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Solution

The correct option is B CD
$R = \frac{Δ V}{Δ I}$ , in the graph CD has only negative slope. So in this portion R is negative.

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