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Q.

When only carrier is transmitted antenna current observed is 8 A when it is modulated with 500 Hz sine wave antenna current becomes 9.6 A. The percentage of modulation is

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a

80 %

b

20 %

c

93.8 %

d

83.76%

answer is C.

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Detailed Solution

We know that, PtPc = 1+μ22  ⇒it2ic2 =  1+μ22 ⇒itic=1+μ22 ⇒89.6=1+μ22 ⇒μ=2225 = 0.938 In percentage, 93.8 %
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