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Average electric and magnetic energy densities of an EM wave are equal

The same question, asked 2 times: 2021 Paper 5, 6 Apr 2023. Every wording below, oldest first.

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  1. Question 1

    2021 Paper 5

    16
    For an electromagnetic wave travelling in free space, the relation between average energy densities due to electric (Ue)\left( U_{e} \right) and magnetic (Um)\left( U_{m} \right) fields is :

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  2. Question 2

    6 Apr 2023

    1
    For the plane electromagnetic wave given by E=E0sin⁡(ωt−kx)E =E_{0}\sin(\omega t - kx) and B=B0sin⁡(ωt−kx)B =B_{0}\sin(\omega t - kx), the ratio of average electric energy density to average magnetic energy density is

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