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Electromagnetic Waves, Poynting Vector, Radiation Pressure and Force 0 points possible (ungraded) Two square objects, each with sides of length b, are located at opposite ends of a thin, extremely light rod. Both squares are illuminated by a plane sinusoidal electromagnetic wave having an electric field of amplitude Eo that falls uniformly on both surfaces and strikes them perpendicular to the plane of their surfaces. One square is covered with a perfectly absorbing coating, and the other is covered with a perfectly reflective coating (see figure below). The electric field at time t = 0 is shown in the figure below. Express your answers to the following questions in terms of E_0 for Eo, mu_0 for Mo, c, b, lambda for 1, t, x, y, z, hati for î, hatj for j and hatk for k as needed. y=0 Electric field at t=0 (Part a) Write a vector expression for the electric field Ē of this electromagnetic wave. E |
Electromagnetic Waves, Poynting Vector, Radiation Pressure and Force O points possible (ungraded) (Part b) Write a vector expression for the magnetic field B of this electromagnetic wave. B Submit Electromagnetic Waves, Poynting Vector, Radiation Pressure and Force O points possible (ungraded) (Part c) Write a vector expression for the Poynting vector S associated with this electromagnetic wave. unt =
Electromagnetic Waves, Poynting Vector, Radiation Pressure and Force O points possible (ungraded) (Part d)) What is the magnitude of the time-averaged force acting on (i) the square covered with a perfectly absorbing coating, (ii) the square covered with a perfectly reflective coating? abs (i) (F 1= ref (ii) (IF" ' 1) =
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