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Q.

A carbon resistor is used in a circuit, at different constant temperatures, T1 and T2T1>T2 for different voltages. Which of the following graphs are correct? [i is the current through the resistor, V is the voltage applied across it]

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a

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b

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c

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d

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answer is A.

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Detailed Solution

R = VI;  

Therefore, the v-i graph will be linearly increasing.

R decreases with temperature because for carbon α is negative.

So R corresponding to higher temperature will be low indicating a higher slope(1/R).

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