Discussion
What happens to FM sidebands as the index increases from zero?
Answer: C
Energy moves outward: successive Bessel orders rise, more sideband pairs carry appreciable power, and the carrier falls, passing through nulls. The spacing stays fixed at the message frequency throughout, since it is set by the modulating frequency rather than by the index. The carrier growing would violate constant total power. And a fixed number of pairs is the narrowband approximation rather than the general behaviour. Watching a spectrum analyser as deviation is increased makes the Bessel behaviour immediately concrete.
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