GK QUESTION#2981
At a specified temperature, consider these statements. Statement I: Resistance of a wire depends on its length and cross-sectional area. Statement II: Resistivity is a material property independent of the wire’s macroscopic shape and size. Statement III: Resistivity depends on the cross-sectional area of the wire. Which statements are correct?
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Answer
A. Only Statements I and II are correct
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Explanation
At a specified temperature, R = ρL/A depends on wire length and area, while resistivity ρ characterises the material rather than its macroscopic dimensions. Statements I and II are correct; III confuses resistance with resistivity.