Question

The graph shown in the figure represents a plot of current versus voltage for given semi-conductor. Identify the region. if any, over which the semi-conductor has a negative resistance.

Answer 1

Resistance of a material can be found out by the slope of the curve V versus I,

that is, $R=\frac{\Delta V}{\Delta I}$

Part BC of the curve shows the negative resistance with the increase in voltage, current decreases.