The resistance of a conductor at absolute zero (OK) is________________?
Correct answer: A. zero almost
- A. zero almost
- B. infinite almost
- C. no prediction at all
- D. may increase or decrease
Explanation
In the ideal textbook model for a metallic conductor, thermal vibrations vanish as the temperature approaches 0 K, so its resistance becomes nearly zero. Option b may be selected by confusing low temperature with the high resistance produced by heating, although real materials can show exceptions such as residual resistance or superconductivity.
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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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