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If the transmitted power is 100KW then the field at a distance ‘R’ is 60mV/m. Suppose if the transmitted power is reduced to 50KW then the field at same distance ‘R’ will be equal to ________

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If the transmitted power is 100KW then the field at a distance ‘R’ is 60mV/m. Suppose if the transmitted power is reduced to 50KW then the field at same distance ‘R’ will be equal to ________

(a) 50mV/m

(b) 42mV/m

(c) 45mV/m

(d) 55mV/m

This question was posed to me during an interview.

My question is taken from Linear Modulation in chapter Amplitude Modulation of Analog Communications

1 Answer

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Best answer
Correct answer is (b) 42mV/m

Best explanation: Since, Field strength (E) is directly proportional to the square root of transmission power i.e. E ∝ √Pt. Therefore  which gives x = 42mV/m

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