Question

The SI unit of resistivity is:

• A. Ohm
• B. Ohm-meter
• C. Ampere
• D. Volt

Hint:

The unit of resistivity is Ohm-meter, reflecting its dependence on resistance and length.

Answer 1

The Correct Option is B

Step 1: Definition of Resistivity.
Resistivity is a property of materials that quantifies how strongly they oppose the flow of electric current. The SI unit of resistivity is Ohm-meter (Ω⋅m), where Ohm is the unit of resistance and meter is the unit of length. Step 2: Formula and Explanation.
Resistivity (\( \rho \)) is related to resistance (\( R \)) as: \[ R = \rho \frac{L}{A} \] where \( L \) is the length and \( A \) is the cross-sectional area. Hence, the SI unit of resistivity is Ohm-meter (Ω⋅m).