Electromagnetic Waves
Given:
m
3
.
0
Find:
?
z
B
2
/
45
m
W
I
ns
t
5
.
1
A plane monochromatic radio wave (
= 0.3 m) travels in vacuum along the positive x-axis, with a
time-averaged intensity
I
= 45 W/m
2
. Suppose at time
t
= 0, the electric field at the origin is measured to
be directed along the positive y-axis with a magnitude equal to its maximum value.
What is
B
z
, the magnetic field at the origin, at time
t
= 1.5 ns?
Solutions
a.)
To find
we can use the following formula:

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