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A plane electromagnetic wave traveling in the positive direction of an x axis in vacuum has
components E_x = E_y = 0 and E_z = (4.2 V/m) cos[(pi times 10^15 s^-1)(t - x/c)]. What is the
amplitude of the magnetic field component? Your answer cannot be understood or graded. More
Information T
Solution
B = E/c
=> Bx = By = 0 ( as Ex, Ey = 0 )
=> Bz = 4.2/(3*10^8) = 1.4*10^-8 T

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