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Unformatted text preview: E (x,t) = 60 π cos(310t + 4x) a y V/m. The magnetic field at point (0,0,0) when t = 0 is 1A/m. The unit of t is second and the unit of x is meter. Find: (1) the phase velocity v p ; (2) the wave impedance η of the media; (3) the relative dielectric constant ε r and relative permeability μ r; (4) the time domain expression for magnetic field; 5. The plane y = 2x separates two isotropic uniform materials. For y < 2x (region 1), ε r1 = 3; and for y > 2x (region 2), ε r2 = 5. Assume D 1 = 2 a x  3 a y + 5 a z nC/m 2 in region 1; (1) Find the angle D 2 makes with D 1 ; (2) Find E 2 in region 2; Answer: 1 (1) (2) (3) (4) 2 (1) (2) 3 (1) (2) 4. (1) (2) (3) (4) 5 (1) (2) MatLab Program (Optional for partial credits)...
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 Fall '11
 WU
 Electromagnet, Magnetic Field, Fundamental physics concepts, Energy density, magnetic ﬂux density, volume charge density

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