Q. The antenna current of an AM transmitter is 8 A when only the carrier is sent, but it increases to 8.93 A when the carrier is sinusoidal modulated. The percentage modulation is nearly
A) 90%
B) 80%
C) 75%
D) 70%
Explanation
(d) $\sqrt{1 + \frac{m^{2}}{2}} = \frac{I_{t}}{I_{c}} = \frac{8.93}{3} = 1.11625$
$\frac{m^{2}}{2} = (1.11625)^{2} - 1$
$m = 0.70 = 70\%$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.