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A 100 V carrier wave is made to vary between 160 V and 40 V by a modulating signal. What is the modulation index?
(1) 0.3
(2) 0.5
(3) 0.6
(4) 0.4
$E_m = 160 - 100 = 60$. $\mu = \frac{E_m}{E_c} = \frac{60}{100} = 0.6$.
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