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

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

  1. A

    1.1 z10-12

  2. B

    2.2 z10-12

  3. C

    4.4 x 10-12

  4. D

    6.4 x10-12

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    Solution:

    average energy density is 12ε0 E2rms  due to electric field

    =12ε0E2=12ε0E022

    =14×8.85×10-12(1)2=2.2×10-12 J/m3

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