Question

The unit of the Poynting vector is ______

Answer 1

Poynting vector:

1. The Poynting vector S is the vector product of $\frac{1}{\mu }E$ and $B$. Where E is the electric field and B is the magnetic field and $\mu$ is the permeability of the medium.
2. The mathematical form is $S=\frac{1}{\mu }E\times B$.
3. The SI unit of the Poynting vector is Watt (W) per square metre (m) or $W/m^2$.

Hence, the unit of poynting vector is Watt per square metre.