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Current versus voltage for a metallic conductor is plotted at two temperatures T1 and T2. The graph at T1 has a larger slope (lower resistance) than that at T2. Which relation between the temperatures is correct?

1. T1 < T2
2. T1 > T2
3. T1 = T2
4. none

Correct answer: T1 < T2

Solution

A steeper I-V line means lower resistance; since metal resistance rises with temperature, the steeper (T1) line is at the lower temperature, so T1 < T2.

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