Q 12-08-216JEE MainJEE Main 2019 (12 Jan, Shift 1)Easy
A $100$ V carrier wave is made to vary between $160$ V and $40$ V by a modulating signal. What is the modulation index?
Answer: (B) $0.6$
$$\mu = \frac{A_{\max} - A_{\min}}{A_{\max} + A_{\min}} = \frac{160 - 40}{160 + 40} = 0.6$$
Solution by Sreeraj P, M.Sc Physics