The resistance of pure metal increases with
Correct answer: A. Increase in temperature
- A. Increase in temperature
- B. Increase in pressure
- C. Decrease in temperature
- D. Decrease in pressure
Explanation
With the increase in temperature, the random motion of electrons increases. As a result, the number of collisions of electrons with the positive ions increases in a metal. Hence, the resistance of a metal increases with increase in temperature.
This question appeared on the NUMS 2022 paper, which you can sit online with every answer explained.
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About Temperature Coefficient of Resistivity
Temperature coefficient of resistivity describes how a material's resistivity changes for each degree change in temperature. Questions use the relation between resistance, temperature and the coefficient, especially for metallic conductors with positive values and semiconductors with negative values. Resistivity is a material property, unlike resistance, which also depends on dimensions.
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