The antenna current of an AM transmitter is 8A, when only Carrier is sent. It increased to 8.93 A , when the carrier is modulated by 9 single sine wave. The percentage modulation.

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50 %

60 %

70 %

80 %

answer is C.

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Detailed Solution

We know that, PTPC=1+m22 ⇒ im2ic2=1+m22 ⇒8.93282=1+m22 ⇒m = 0.7 i.e 70%

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