Communication Systems
In Modulation, “carrier” is

Voltage with constant frequency, phase or amplitude
Resultant wave
Voltage for which frequency, phase or amplitude is varied
Speech voltage to be transmitted

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Communication Systems
In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then

Amplitude of distant sidebands first increases, then decreases
Amplitude of distant sidebands remains constant
Amplitude of distant sidebands increases
Amplitude of distant sidebands decreases

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