value of the electric field is 2 mV/m and it is moving in the ty direction. The average density in the radiation is,
value of the electric field is 2 mV/m and it is moving in the ty direction. The average density in the radiation is,
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Transcribed Image Text:The general equation for the electric and the magnetic field as per the electromagnetic
theory is,
E = Emax. cos (kx- ot)
B= Bmax cos(kx- or
The energy per unit volume in an electric field is,
1
The energy per unit volume in a magnetic field is,
1 B
U
2 Ho
Also, the energy density and the total energy associated with the magnetic field and the
1
electric field are equal. The rate with the energy flows in an EM wave is S = –(ExB).
In the positive x direction, a plane EM wave varies sinusoidally at 99 MHz and the peak
value of the electric field is 2 mV/m and it is moving in the ±y direction. The average
density in the radiation is,
(a) 1.75 x10-14 J/m²
(b) 1.5 J/m
(c) 30x10-13 J/m
(d) 0.755 x10-14 J/m³
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