The magnitude of the Poynting vector of a planar electromagnetic wave has an average value of 0. 724 w/m^2. The maximum value of the magnetic field in the wave will be B = 7.79 * [tex]10^{-8}[/tex] T .
The Poynting vector, named after John Henry Poynting, is used in order to demonstrate the energy flux density of an EM field. Per definition, the Poynting vector is the result of the vector product of the field's electric and magnetic components
Pointing vector of electromagnetic wave =( 1 / mu0) * E B
where
E = Electric field
B = Magnetic field
Average value of Pointing vector of electromagnetic wave
<S> = 0.724 = (1/2 mu0) EB equation (1)
Also
E = c B
substituting the value of E in equation (1)
Pointing vector = (1/2 mu0) * (c B * B)
0.724 = (1/2 mu0) * c[tex]B^{2}[/tex]
B = 7.79 * [tex]10^{-8}[/tex] T
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