Question

# Graph showing the variation of current versus voltage for a material GaAs is shown in the figure. Identify the region of(i) Negative resistance(ii) Where Ohm's law is obeyed.

Solution

## According to Ohm's Law, the current passing through a conductor is directly proportional to the voltage applied across it.Thus $$V\propto I$$$$\implies \dfrac{V}{I}=R$$$$R$$ is the resistance of the conductor.Hence for Ohm's law to obeyed, the slope of $$I$$ vs $$V$$ curve is constant and positive. Hence region BC obeys Ohm's law.For $$R$$ to be negative, slope of $$I$$ vs $$V$$ curve should be negative, which is there for region DE.Physics

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