The resistance of a metallic conductor increases with the rise in temperature. This is becausethe frequency of collisions among the vibrating atoms of the conductor and electrons
Correct answer: A. Increases.
- A. Increases.
- B. Decreases.
- C. Becomes zero.
- D. Remains unchanged.
Explanation
The resistance of a metallic conductor increases with temperature because the atoms within the conductor vibrate more with added energy, leading to more frequent collisions with conduction electrons. This increased collision rate impedes the flow of electrons, causing resistance to rise. In contrast, a decrease or zero resistance would imply fewer obstacles for electron flow, which is not the case in standard metallic conductors. Therefore, the correct answer is that resistance increases.
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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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