Answer: Mutually perpendicular.
- A All parallel
- B Mutually perpendicular
- C E and B parallel, wave perpendicular
- D Random
Correct answer: B. Mutually perpendicular
Explanation: EM waves are transverse: the electric field E, magnetic field B and the direction of propagation are mutually perpendicular to one another.
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.