Question

Define resistivity of a material. Give its unit.

Answer 1

• Resistivity of the material is defined as the resistance offered to current flow by a conductor of unit length having unit area of cross-section.
• It is the property of the material, does not depend on physical dimensions.
• Unit is ohm-metre$\left(\Omega m\right)$
• Resistance of an object is related to resistivity as follows: $R=\frac{\rho l}{A}$