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Electromagnetic Waves — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsElectromagnetic Waves1 Mark
MCQ
Choose the correct answer from the alternatives given. Electromagnetic wave consists of periodically oscillating electric and magnetic vectors:
  • A
    In mutually perpendicular planes but vibrating with a phase difference of $\pi$
  • B
    In mutually perpendicular planes but vibrating with a phase difference of $2\pi$
  • C
    In randomly oriented planes but vibrating in phase
  • ✓
    In mutually perpendicular planes but vibrating in phase
✓

Answer

Correct option: D.
In mutually perpendicular planes but vibrating in phase
The Electromagnetic wave consists of the two mutually perpendicular electric and magnetic fields present in the medium and also both being perpendicular to the direction of propagation of the wave. The two fields are in same phase as they obtain their peaks at the same instant.
An electromagnetic wave consists of periodically oscillating electric and the magnetic vector in mutually perpendicular planes but vibrating in phase.

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