Poynting Vector


Poynting Vector

The rate of flow of energy crossing a unit area

$$ \large \vec{S} = \frac{1}{\mu_0} \vec{E} \times \vec{B} $$$$ \large S_\text{avg} = \frac{E_\text{max} B_\text{max}}{2\mu_0} $$

Radiation Pressure

$$ \large P = \frac{|S|}{c} $$

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