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  4. In AM modulation, a signal is modulated on a carrier wave such that maximum and minimum amplitude are found to be 6 V and 2 V respectively. The modulation index is

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Q. In AM modulation, a signal is modulated on a carrier wave such that maximum and minimum amplitude are found to be $6 V$ and $2 V$ respectively. The modulation index is

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Solution:

modulation index $=\frac{ V _{\max }- V _{\min .}}{ V _{\max }+ V _{\min .}} \times 100 \%$
$ =\frac{6-2}{6+2} \times 100 \%=50 \%$