Questions
The rms value of the electric field of a plane electromagnetic wave is 314 V/m. The average energy density of electric field and the average energy density are
a
4.3 ×10-7 Jm-3 ; 2.15 ×10-7 Jm-3
b
4.3 ×10-7 Jm-3 ; 8.6 ×10-7 Jm-3
c
2.15 ×10-7 Jm-3 ; 4.3 ×10-7 Jm-3
d
8.6 ×10-7 Jm-3 ; 4.3 ×10-7 Jm-3
detailed solution
Correct option is B
Erms=314 Vm-1 ; E0=Erms2 =314 x 2=444 Vm-1Average energy density of electric fielduE=14∈0E02 =14 x 8.8 x 10-124442 =433699 x 10-12 =4.3 x 10-7 Jm-3∴ Average energy density = 2uE = 2 x 4.3 x10-7 = 8.6 x 10-7 Jm-3Talk to our academic expert!
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