Question

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

Answer 1

According to Ohm's Law
$V\propto I$
$\therefore$ $V=IR$
For the negative resistance, as we increase the voltage, the current will decrease.
Therefore from the graph, we find that the current in $CD$ is decreased when voltage is increased.
Hence, option $\left(A\right)$ is correct option.