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The power of a wave having a magnetic field intensity of 2.5 units is(a) 1.17 kilo watt(b) 1.17 mega watt(c) 1.17 watt(d) 11.7 wattI had been asked this question during an interview.My question comes from Transients in division Waveguides of Electromagnetic Theory |
Answer» RIGHT answer is (a) 1.17 kilo watt The explanation: The POWER of a wave is given by P = 0.5 η H^2, where η is the intrinsic IMPEDANCE and H is the magnetic field INTENSITY. On substituting for η = 377 and H = 2.5, we GET P = 0.5 x 377 x 2.5^2 = 1.17 kilo watts. |
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