Reciprocal of resistivity is called__________________?
Correct answer: C. conductivity
- A. resistance
- B. inductance
- C. conductivity
- D. flexibility
Explanation
Conductivity is the reciprocal of resistivity, σ = 1/ρ, and its SI unit is siemens per metre. Option a, resistance, is different because resistance also depends on the conductor's length and cross-sectional area.
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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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