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MDCAT Physics QUESTION #4401
Question 1
The reciprocal of the resistivity of a material is called its:
  • Impedance
  • Conductivity✔️
  • Admittance
  • Reactance
Correct Answer Explanation
Electrical conductivity $\sigma = \dfrac{1}{\rho}$ where $\rho$ is resistivity. Conductivity measures how easily a material allows electric current to flow. Its SI unit is $S\ m^{-1}$ (Siemens per metre).