The two metals having the same resistance can be differentiated by their value:
Correct answer: D. Conductivity
- A. Resistance
- B. Conductance
- C. Temperature coefficient of resistivity
- D. Conductivity
Explanation
When two metals have the same resistance, they can be differentiated based on their conductivity. Conductivity is a measure of how easily a material allows the flow of electric current. It is the reciprocal of resistivity.
This question appeared on the ETEA MDCAT 2010 paper, which you can sit online with every answer explained.
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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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