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Questions  

In an electromagnetic wave, the amplitude of electric field is 1V/m. The frequency of wave is  5 x 1014 Hz. The wave is propagating along z-axis.The average energy density of electric field, in Joule/m3, will be

a
1.1 z10-12
b
2.2 z10-12
c
4.4 x 10-12
d
6.4 x10-12

detailed solution

Correct option is B

average energy density is 12ε0 E2rms  due to electric field

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