Question

Write the definition and dimensional formula of electrical conductivity. 
 

Hint:

The higher the electrical conductivity, the better the material is at conducting electricity, with metals typically having high conductivity.

Answer 1

Electrical conductivity (\( \sigma \)) is the ability of a material to conduct an electric current. It is the reciprocal of resistivity (\( \rho \)), and its unit is Siemens per meter (S/m). \[ \sigma = \frac{1}{\rho}. \] The dimensional formula of electrical conductivity is: \[ [\sigma] = \text{M}^1 \text{L}^{-3} \text{T}^3 \text{A}^{-2}. \]