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(b) Figure 335 may help in visualizing this. The direction of propagation (along the
y
axis) is perpendicular to
G
B
(presumably along the
x
axis, since the problem gives
B
x
and
no other component) and both are perpendicular to
G
E
(which determines the axis of
polarization). Thus, the wave is
z
polarized.
(c) Since the magnetic field amplitude is
B
m
= 4.00
µ
T, then (by Eq. 335)
E
m
= 1199
V/m
3
1.20 10 V/m
≈×
. Dividing by
2
yields
E
rms
= 848 V/m. Then, Eq. 3326 gives
I
I
c
E
==
×
0
3
191 10
rms
22
W/m
..
(d) Since
kc =
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 Spring '08
 Any
 Physics

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