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Electromagnetic Waves question

2021 · Q152
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Electromagnetic Waves question

2021 · Q152

NEETPhysicsElectromagnetic WavesMCQ+4 / −1
For a plane electromagnetic wave propagating in x-direction, which one of the following combination gives the correct possible directions for electric field (E) and magnetic field (B) respectively?
  1. A
    −j^+k^,−j^+k^- \widehat j + \widehat k, - \widehat j + \widehat k−j​+k,−j​+k
  2. B
    j^+k^,j^+k^\widehat j + \widehat k, \widehat j + \widehat kj​+k,j​+k
  3. C
    −j^+k^,−j^−k^- \widehat j + \widehat k, - \widehat j - \widehat k−j​+k,−j​−k
  4. D
    j^+k^,−j^−k^\widehat j + \widehat k, - \widehat j - \widehat kj​+k,−j​−k
View written solutionFree

Correct answer: C

Wave in x direction

C = E→{\overrightarrow E }E ×\times× B→{\overrightarrow B }B

(−j^+k^)×(−j^−k^)\left( { - \widehat j + \widehat k} \right) \times \left( { - \widehat j - \widehat k} \right)(−j​+k)×(−j​−k)

=i^+i^ = \widehat i + \widehat i=i+i

=2i^ = 2\widehat i=2i

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