JEE Main202226 Jul 2022Evening ShiftPhysicsCommunication SystemActual
The maximum and minimum voltage of an amplitude modulated signal are 60 V and 20 V respectively. The percentage modulation index will be
Options
- A0 . 5 %
- B50 %
- C2 %
- D30 %
Correct answer
B. 50 %
Step-by-step solution
If amplitude of carrier wave is A c and amplitude of message wave is A m , A m a x = A c + A m and A m i n = A c - A m Modulation index, M i = A m A c = A m a x - A m i n 2 A m a x + A m i n 2 = 60 - 20 60 + 20 = 1 2 = 50 %