Specific resistance of a wire____________________?
Correct answer: C. will depend on the type of material of the wire
- A. will depend on its length
- B. will depend on its radius
- C. will depend on the type of material of the wire
- D. will depend on none of the above
Explanation
Specific resistance, or resistivity, is an intrinsic property determined mainly by the material and its temperature, not by the wire's length or radius. Option a, dependence on length, confuses resistivity with resistance, since R = ρL/A.
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About Resistance and Resistivity
Resistance measures opposition to current in a conductor and follows R = V/I for an ohmic conductor, while resistivity is an intrinsic property of the material. Questions use R = ρL/A, examine effects of length, cross-sectional area and temperature, and distinguish resistance, resistivity, conductance and conductivity.
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