Question

Question 3 (12 points The electric field of a plane wave propagating in sea water with (t.-80,-, a Determine the: (a) direction of the wave propagation, () atemation constant, (c) phih lc intrinsic impedance, (d) the wavelength, (e) the magnetic field H, () the distance at w field will drop to 1% of its initial value. which the electric

Answer 1

E = 100 e^- alpha z cos (10^8 t - Beta z) ax E_r = 80: w_r = 1: sigma = 4 s/m a) Direction of wave propagation is + z - direction the standard equation is in + z - Direction E = E_0 e^- alpha z (w t - Beta z) ax b) sea water is a good conductor For conductor Attenuation constant = alpha alpha = squareroot w /2 sigma = squareroot 10^8 Times 4 Pi/10^- 7 Times 1/2 Times 4 { w = w_0 w_r w_0 = 4 Pi Times 10^- 7 H/M } alpha = squareroot 5 10 Pi/2 = squareroot 5 Pi alpha = 3.96 Nephers c) v = velocity of the medium with
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