Calculation of modulation index using antenna current

Q.  An AM transmitter has an antenna current changing from 5 A un modulated  to 5.8 A. What is the percentage of modulation?
- Published on 13 Oct 15

a. 38.8%
b. 83.14%
c. 46.8%
d. 25.2%

ANSWER: 83.14%
 
Modulation index m is given by
m= √ (2{It/Ic}2-1)
= √ (2 (5.8/5)2 -1)
= √ (2 (5.8/5)2 -1)
= 0.8314
= 83.14%

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