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Question

VI graph for two wires A and B are shown in the figure. If the both wires are of same length and same thickness, which of the two is made of a material of high resistivity? Given justification for your answer.
1451512_0599ac8a583d4c759f5bd8a9bf3ee89c.png

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Solution

From the graph, slope of wire A is greater slope =dydx=VIR=VI= slope
Hence wire A has greater resistance. The heat produced by resistor is given by P=I2.RT. It is directly proportional to square of current paring through it resistance and time for which the current passes through the conductor. Hence A wire is made of a material of high resistivity.

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