The electric vector in an electromagnetic wave traveling through an evacuated
region of space is given by
E(x,t) = (4.60 V/m)
^
k
cos[(1.15×107 rad/m)x -wt]
(a) In which direction is the wave traveling?
ANS: In the positive x-direction.
(b) In what direction is the magnetic field pointing?
ANS: in the negative y-direction.
(c) Calculate the angular frequency of the wave.
w
=
kc
=
(1.15×107 rad/m)(3.00×108 m/s )
=
3.45×1015 rad/s
(d) Calculate the magnetic field amplitude Bo for the
corresponding B(x,t) wavefunction.
Bo=Eo/c=(4.60 V/m)/(3.00×108 m/s) = 1.53×10-8 T
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version 3.85. On 19 Apr 2016, 16:16.