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

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50 %

60 %

70 %

80 %

answer is C.

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Detailed Solution

$W e k n o w t h a t, \frac{P_{T}}{P_{C}} = 1 + \frac{m^{2}}{2} \Rightarrow \frac{{i_{m}}^{2}}{{i_{c}}^{2}} = 1 + \frac{m^{2}}{2} \Rightarrow \frac{{8.93}^{2}}{8^{2}} = 1 + \frac{m^{2}}{2} \Rightarrow m = 0.7 i . e 70 %$

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