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JEE Main 202116 MarchMorning Shift
Exam
JEE Main
Year
2021
Date
16 March
Shift
Morning Shift
Subject
Physics
Chapter
Electromagnetic Waves

JEE Main 2021 · 16 March · Morning Shift · Physics · Electromagnetic Waves

For an electromagnetic wave travelling in free space, the relation...

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 :

Options

  1. AUe=Um{U}_{e} = {U}_{m}
  2. BUe>Um{U}_{e} > {U}_{m}
  3. CUe<Um{U}_{e} < {U}_{m}
  4. DUe≠Um{U}_{e} \ne {U}_{m}

Correct answer

A. Ue=Um{U}_{e} = {U}_{m}

Step-by-step solution

In EMWEMW, Average energy density due to electric \left({U}_{e}\right)andmagnetic(Um)and magnetic \left({U}_{m}\right) fields is same.
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