Extra exam question E3A14
Subelement E3, RADIO WAVE PROPAGATION· Group E3A
What are circularly polarized electromagnetic waves?
- A.Waves with an electric field bent into a circular shape
- B.Waves with rotating electric and magnetic fields (correct answer)
- C.Waves that circle Earth
- D.Waves produced by a loop antenna
WhyCircularly polarized electromagnetic waves have electric and magnetic fields that rotate as the wave travels. A circularly polarized electromagnetic wave has electric and magnetic fields that rotate as the wave travels, tracing out a circular pattern over time rather than staying fixed in one plane the way a linearly polarized wave does, answer B. It's not that the field is bent into a physical circular shape, has nothing to do with the wave orbiting the Earth, and isn't defined by what kind of antenna produced it, loop antennas don't inherently produce circular polarization.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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