Question

The radiation resistance of an antenna having a power of 120 units and antenna current of 5A is (a) 4.8 (b) 9.6 (c) 3.6 (d) 1.8 This question was addressed to me during an interview. My doubt is from Power, Power Loss and Return Loss topic in section EM Wave Propagation of Electromagnetic Theory Select the correct answer from above options Electromagnetic Theory questions and answers, Electromagnetic Theory questions pdf, Electromagnetic Theory question bank, Electromagnetic Theory questions and answers pdf, mcq on Electromagnetic Theory pdf,electromagnetic theory book pdf,electromagnetic theory pdf notes,electromagnetic theory lecture notes,electromagnetic theory of light,maxwell electromagnetic theory,electromagnetic theory proposed by,electromagnetic theory engineering physics,electromagnetic theory nptel

Answer 1

The correct choice is (a) 4.8 Easy explanation: The power of an antenna is given by Prad = Ia^2 Rrad, where Ia is the antenna current and Rrad is the radiation resistance. On substituting the given data, we get Rrad = Prad/Ia^2 = 120/5^2 = 4.8 ohm.