2.7 Poynting vector

1.1 Displacement current
1.3 Maxwell's equations

2.1 Properties of electromagnetic waves
2.2 Production of electromagnetic waves
2.3 Energy density of electromagnetic waves
2.4 Intensity of electromagnetic waves
2.5 Momentum of electromagnetic waves
2.6 Radiation pressure
2.7 Poynting vector
2.8 Electromagnetic spectrum

In electromagnetic wave, the rate of flow of energy perpendicularly through a unit area is described by a vector known as poynting vector.

The poynting vector is, $$\overrightarrow S = \frac{1}{{{\mu _0}}}\left( {\overrightarrow E \times \overrightarrow B } \right)$$

where,

${{\mu _0}}$: Permeability of space

${\overrightarrow E }$: Electric field

${\overrightarrow B }$: Magnetic field

Note: The SI unit of poynting vector is $W{m^{ - 2}}$.