The radiation resistance of an antenna having a power of 120 units and antenna current of 5A is

The radiation resistance of an antenna having a power of 120 units and antenna current of 5A is Correct Answer 4.8

The power of an antenna is given by Prad = Ia2 Rrad, where Ia is the antenna current and Rrad is the radiation resistance. On substituting the given data, we get Rrad = Prad/Ia2 = 120/52 = 4.8 ohm.
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