ch33-p089 - z axis. (b) Since k is given as 1.57 10 7 /m,...

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89. (a) The polarization direction is defined by the electric field (which is perpendicular to the magnetic field in the wave, and also perpendicular to the direction of wave travel). The given function indicates the magnetic field is along the x axis (by the subscript on B ) and the wave motion is along – y axis (see the argument of the sine function). Thus, the electric field direction must be parallel to the
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Unformatted text preview: z axis. (b) Since k is given as 1.57 10 7 /m, then = 2 / k = 4.0 10 7 m, which means f = c / = 7.5 10 14 Hz. (c) The magnetic field amplitude is given as B m = 4.0 10 6 T. The electric field amplitude E m is equal to B m divided by the speed of light c . The rms value of the electric field is then E m divided by 2 . Eq. 33-26 then gives I = 1.9 kW/m 2 ....
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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