Resistance of a wire on increasing its temperature will_________________?
Correct answer: A. increase with rise in temperature
- A. increase with rise in temperature
- B. decrease with rise in temperature
- C. will remain same
- D. depends upon altitude of experimentation
Explanation
For a metallic wire, increasing temperature increases lattice vibrations, which causes more collisions for electrons and therefore increases resistance. Option b is the likely choice because some semiconductors have resistance that decreases with temperature, but the usual wire conductor has a positive temperature coefficient.
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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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