Question
How are the component fields of an electromagnetic wave oriented?
Answer Options
- A) They are parallel
- B) They are tangential
- C) They are at right angles
- D) They are 90 degrees out of phase
Correct Answer: C
Explanation
As discussed in the previous question, an electromagnetic wave consists of an electric field (E-field) and a magnetic field (H-field). These two energy fields are linked and propagate together through space, carrying the radio energy. For the wave to be self-sustaining, the fields must maintain a specific geometric relationship relative to each other.
The component fields of an electromagnetic wave are always oriented at right angles (90 degrees) to one another. Furthermore, both the electric and magnetic fields are at a right angle to the direction of propagation (the direction the wave is traveling). This three-dimensional, mutually perpendicular relationship is a defining feature of electromagnetic radiation.
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