Question

SI unit of \( \rho \) (rho) is:

• A. \( \Omega \, \text{m} \)
• B. \( \text{Ohm} \text{ m}^{-1} \)
• C. \( \text{Ohm}^{-1} \)
• D. \( \text{cm}^{-1} \)

Hint:

Resistivity depends on the material and is measured in \( \Omega \, \text{m} \).

Answer 1

The Correct Option is A

The SI unit of resistivity (\( \rho \)) is \( \Omega \, \text{m} \), which is derived from: \[ \rho = R \cdot \frac{A}{l}, \] where \( R \) is resistance, \( A \) is cross-sectional area, and \( l \) is length.