Question

Define the term resistivity of a conductor. Give its SI unit.

Answer 1

1. Resistivity is an intrinsic property of the material that measures the ability of a material to resist the current flow.
2. The resistivity of a material is the resistance offered by $1m$ length of a wire of material having cross-sectional area of $1m^2$.
3. The expression for resistivity $\left(\rho \right)$ of a conductor is given by $\rho =\frac{R\times A}{l}$ where $R$ is the resistance, $l$ is the length of the wire and $A$ is the cross-sectional area of the wire.
4. SI unit of resistivity is $ohmmetre\left(\Omega m\right)$.