Question

i) Graph showing the variation of current versus voltage for a material Ga-As is shown in figure.Identify the region of negative resistance.
ii) Where Ohm's law is obeyed.

Answer 1

i) In region DE,material GaAs (Gallium Arsenide) offers negative resistance,because slope $<\frac{\Delta v}{\Delta I}<0$
ii)The region BC approximately passes through the origin, (or current also increases with the increase of voltage).hence,if follows Ohm's law and in this region $\frac{\Delta v}{\Delta I}>0$