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Q4. Electromagnetic Waves. १६० 5 In a non-conducting medium with ε = and µ =5µ。, the magnetic field of a plane polarized electromagnetic wave is given by: Ē(z,t) = Esin(wt − kz + n)ŷ (a) Determine the phasor Ẽ(z) of Ē(z, t). [5 marks] (b) Determine the phasor (z) using Maxwell's phasor equations. [9 marks] (c) Determine the magnetic field (z, t). [5 marks] (d) Express k (wavenumber) as a function of and c (the speed of light). [1 mark] (e) Sketch a diagram of the electromagnetic wave at t=0 and indicate the direction of propagation. Show the electric and magnetic field direction. [5 marks]