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8. Electromagnetic waves — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics8. Electromagnetic waves1 Mark
MCQ
The direction of poynting vector represents
  • A
    The direction of electric field
  • B
    The direction of magnetic field
  • ✓
    The direction of propagation of $EM$ wave
  • D
    The direction opposite to the propagation of $EM$ wave
✓

Answer

Correct option: C.
The direction of propagation of $EM$ wave
c
(c)

$\bar{S}=\frac{\vec{E} \times \bar{B}}{\mu_0}$

$\vec{E} \times \vec{B} \Rightarrow$ direction of wave propagation

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