A wir of uniform cross section A, length I and resistance R is cut into two equal pieces. The resistivity of each piece will be
Correct answer: A. the same
- A. the same
- B. one fourth
- C. double
- D. one half
Explanation
Resistivity remains constant, it is a constant value.
This question appeared on the ETEA MDCAT 2011 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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