# Effective Modulation Index ?

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#### achillez16

##### Newbie level 3
A 50 V rms carrier is modulated by a square wave = 4V/pi ( sin wt + 1/3 sin 3wt + 1/5 sin 5wt + .. ) if the 1st 4 harmonics are considered then find Meff ?? if V = 20 v ?

I tried to use the m = Ei / Ec formula for each of the harmonics but the ans is still coming wrong . .

The correct ans is 0.77 ..