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(C) The resistance $R$ is defined by the relation $R = V/I$. In an $I-V$ graph,the slope of the curve is given by $dI/dV$,which is equal to $1/R$. For

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$CD$

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(C) The resistance $R$ is defined by the relation $R = V/I$. In an $I-V$ graph,the slope of the curve is given by $dI/dV$,which is equal to $1/R$. For negative resistance,the slope $dI/dV$ must be negative. Looking at the graph,in the portion $CD$,as the voltage $V$ increases,the current $I$ decreases. Therefore,the slope $dI/dV$ is negative in the region $CD$,which corresponds to negative resistance.

From the graph between current $I$ and voltage $V$ shown below,identify the portion corresponding to negative resistance.

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