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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.

472025.jpg


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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