Resistance of a super conductor is ______________________?
Correct answer: C. zero
- A. finite
- B. infinite
- C. zero
- D. changes with every conductor
Explanation
Below its critical temperature, a superconductor allows charge to flow without resistance, so its resistance is zero ohm. Option a, finite resistance, reflects the behaviour of an ordinary conductor and ignores the superconducting state.
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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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