Q 12-14-199JEE MainJEE Main 2018 (16 Apr, Shift 1)Easy
A carrier wave of peak voltage $14\ \text{V}$ is used for transmitting a message signal. The peak voltage of the modulating signal given to achieve a modulation index of $80\%$ will be:
Answer: (C) $11.2\ \text{V}$
Modulation index $\mu = \dfrac{A_m}{A_c}$:
$$A_m = 0.8\times14 = 11.2\ \text{V}$$
Solution by Sreeraj P, M.Sc Physics