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[" Qn 19.A point source of electromagnetic radiation has an average power "],[" output of "800W" .The maximum value of electric field at a distance of "4.0],[" m from the source is: "],[" (a) "54.77V/m],[" (b) "57.8V/m],[" (b) "64.7V/m],[" (d) "56.72V/m]

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