If a substance has negative temperature coefficient its resistance
Correct answer: C. Decreases with an increase in temperature
- A. Increases with an increase in temperature
- B. Decreases with a decrease in temperature
- C. Decreases with an increase in temperature
- D. None of the above
Explanation
Materials with a negative temperature coefficient exhibit a decrease in resistance as temperature increases. Option C correctly describes this behavior. Option A and B describe scenarios that are typical of positive temperature coefficients, where resistance increases with temperature. Option D is incorrect because option C accurately captures the behavior of a negative 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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