Q. 74.0( 5 Votes )
The magnetic fiel
Given: The equation of magnetic field of a plane electromagnetic
B = (200 μT) sin [(4.0 × 1015 s–1) (t –x/c)]
where the amplitude of magnetic field is .
The amplitude of the electric field is related with amplitude of
magnetic field as
where C is the speed of light in free space and E0 is the amplitude
of electric field.
Thus the electric field intensity is given as
The energy density associated with an electric field is given as
where Ud is the energy density, ϵ0 is the electric permittivity of free space(vacuum) and is equal to 8.85 × 10-12 C2 N-1 m-2 and E0 is the amplitude of electric field.
Thus the electric field energy density is given by
The maximum electric field is and the corresponding
electric field energy density is .
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