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(a) If A and B represent the maximum amp...

(a) If A and B represent the maximum amplitudes of an amplitude modulated wave, wrigte the expression for the modulation index in terms of A and B.
(b) A message signal of frequency 20 kHz and peak voltage 10 V is used to modulate a carrier of frequency 2 MHz and peak voltage of 15 V. Calculate the modulation index. Why the modulation index is generally less than one ?

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