Q.

If min voltage in an AM wave was found to be 1.1 V and max voltage 10 V. The % modulation index is

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a

80.2 %

b

66.67 %

c

64.25 %

d

76.25 %

answer is A.

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Detailed Solution

The % of modulation index  = m=Emax−EminEmax+Emin×100  =  10−1.110+1.1 ×100 = 80.2%
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If min voltage in an AM wave was found to be 1.1 V and max voltage 10 V. The % modulation index is