Poynting Vector

#Physics

Topics

• Electromagnetic Energy

$\displaystyle \vec{S}=\frac{1}{{\mu}_{0}}(\vec{E}\times \vec{B})$

• Points toward the direction of energy flow (e.g. in the case of light)
• $\displaystyle {\mu}_{0}$ is the magnetic constant
• $\displaystyle \vec{E}$ is the electric field
• $\displaystyle \vec{B}$ is the magnetic field

$\displaystyle \vec{S}=\frac{1}{\mu}(\vec{E}\times \vec{B})$

• In the case when EM waves travel through materials
• $\displaystyle \mu$ is the permeability of the material