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The Antenna current of an AM transmitter is 9A, when only the carrier is sent. But it increases to 9.36A when the carrier is modulated by a single sine wave. Then the percentage of modulation is
  • a)
    70.1%                         
  • b)
    40.4%
  • c)
    89.8%                         
  • d)
    20.6% ​
Correct answer is option 'B'. Can you explain this answer?
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The Antenna current of an AM transmitter is 9A, when only the carrier ...
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The Antenna current of an AM transmitter is 9A, when only the carrier ...
Given Data:
Antenna current with carrier only = 9A
Antenna current with modulated carrier = 9.36A

Calculating Percentage of Modulation:
To calculate the percentage of modulation, we use the formula:
Percentage of Modulation = ((I_max - I_min) / I_min) * 100

Calculations:
Given, I_max (modulated carrier) = 9.36A
I_min (carrier only) = 9A
Percentage of Modulation = ((9.36 - 9) / 9) * 100
Percentage of Modulation = (0.36 / 9) * 100
Percentage of Modulation = 0.04 * 100
Percentage of Modulation = 4%

Final Answer:
Therefore, the percentage of modulation is 4%.

Explanation:
The increase in antenna current from 9A to 9.36A when the carrier is modulated indicates the addition of modulation signal. By calculating the percentage of increase in current, we can determine the percentage of modulation. In this case, the percentage of modulation is 4%.
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The Antenna current of an AM transmitter is 9A, when only the carrier is sent. But it increases to 9.36A when the carrier is modulated by a single sine wave. Then the percentage of modulation isa)70.1%b)40.4%c)89.8%d)20.6% ​Correct answer is option 'B'. Can you explain this answer?
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