For an electromagnetic wave travelling in free space,

Question:

For an electromagnetic wave travelling in free space, the relation between average energy densities due to electric (Ue ) and magnetic (Um) fields is :

  1. $\mathrm{U}_{\mathrm{e}}=\mathrm{U}_{\mathrm{m}}$

  2. $U_{e}>U_{m}$

  3. $\mathrm{U}_{\mathrm{e}}<\mathrm{U}_{\mathrm{m}}$

  4. $\mathrm{U}_{\mathrm{e}} \neq \mathrm{U}_{\mathrm{m}}$

Correct Option: 1

Solution:

In EMW, Average energy density due to electric $\left(U_{\rho}\right)$ and magnetic $\left(U_{m}\right)$ fields is same.

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