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(A) The resistance $R$ is defined by the relation $R = \frac{V}{I}$.In a $V-I$ graph, the resistance is given by the slope of the graph, but here the

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(A) The resistance $R$ is defined by the relation $R = \frac{V}{I}$.In a $V-I$ graph, the resistance is given by the slope of the graph, but here the graph is plotted as $I$ versus $V$.Therefore, the conductance $G = \frac{I}{V}$ is represented by the slope of the $I-V$ graph.Resistance $R = \frac{1}{	ext{slope of } I-V 	ext{ graph}}$.At point $A$, the slope of the tangent to the curve is negative (as the current $I$ decreases with increasing voltage $V$).Since the slope is negative, the resistance $R$ is negative at point $A$.

The resistance as shown in the figure is negative at

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