A student carried out an experiment and plotted a V-I graph of a nichrome wire at temperatures T1, T2 and T3 as shown in the figure below. At what temperature does V-I graph not obey ohm’s law?

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None of these

answer is C.

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Detailed Solution

A student carried out an experiment and plotted a V-I graph of a nichrome wire at temperatures T1, T2 , and T3 as shown in the figure. V-I graph does not obey ohm’s law at any of the above temperatures. So, none of the above is the answer.
Ohm’s law states that the voltage across a conductive element is directly proportional to the amount of current passing through it. Since the graph at all the temperatures is a straight line, ohm’s law is disobeyed at all the temperatures.

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