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Electromagnetic Waves question

2017 · Q133
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Electromagnetic Waves question

2017 · Q133

NEETPhysicsElectromagnetic WavesMCQ+4 / −1
In an electromagnetic wave in free space that root mean square value of the electric field is Erms = 6 V m−-−1. The peak value of the magnetic field is
  1. A
    2.83 ×\times× 10−-−8 T
  2. B
    0.70 ×\times× 10−-−8 T
  3. C
    4.23 ×\times× 10−-−8 T
  4. D
    1.41 ×\times× 10−-−8 T
View written solutionFree

Correct answer: A

The rms value of magnetic field

Brms = Ermsc{{{E_{rms}}} \over c}cErms​​ = 6(3×108){6 \over {\left( {3 \times {{10}^8}} \right)}}(3×108)6​ = 2 × 10– 8 T

Now peak value of magnetic field

Bpeak = 2Brms\sqrt 2 {B_{rms}}2​Brms​ = 2.83 ×\times× 10−-−8 T

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