CBSE Class 12 Physics 2018 Delhi Set 1 Paper

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Question : 10
Total: 26
A carrier wave of peak voltage 15V is used to transmit a message signal. Find the peak voltage of the modulating signal in order to have a modulation index of 60%.
Solution:  
Formula for modulation index
Finding the peak value of the modulating signal
We have, µ=
Am
Ac

Here, µ=60%=
3
5

Am=µAc=
3
5
×15V
=9V
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