Answer:
The instantaneous voltage of carrier wave of amplitude E, angular frequency \[\omega \] and phase angle \[\phi \] is given by \[e=E\sin (\omega t+\phi )\] When amplitude E of the carrier wave varies in accordance with the modulating wave (keeping \[\omega \] and \[\phi \] constant), we get amplitude modulation. When \[\omega \] is varied, we get frequency modulation and when \[\phi \] is varied, we get phase modulation.
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