The reciprocal of the resistivity of a material is called its:
Correct answer: B. Conductivity
- A. Impedance
- B. Conductivity
- C. Admittance
- D. Reactance
Explanation
Conductivity measures how readily a material carries current and is the reciprocal of resistivity, with units of siemens per metre. Admittance is the reciprocal of impedance and reactance is the opposition offered by a capacitor or inductor, both of which belong to circuit analysis rather than to material properties. Copper has a high conductivity and rubber a very low one.
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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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