Answer: Perpendicular to each other and both perpendicular to propagation.
- A Parallel to each other and to propagation direction according to conventional understanding
- B Perpendicular to each other and both perpendicular to propagation
- C Parallel to each other, perpendicular to propagation in routine practice
- D Antiparallel to propagation overall in most cases under typical conditions
Correct answer: B. Perpendicular to each other and both perpendicular to propagation
Explanation: EM waves: E perpendicular to B, both perpendicular to direction of propagation. All three are mutually perpendicular.
In an electromagnetic wave, the oscillating electric field (E) and magnetic field (B) are perpendicular to each other and to the direction the wave travels - a purely transverse wave that needs no medium, unlike sound.
Concept context
Maxwell's equations, EM spectrum, properties, and applications of each band.