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Question
Physics
The average value of electric energy density in an electromagnetic wave is ( E0 is peak value)
Q. The average value of electric energy density in an electromagnetic wave is (
E
0
is peak value)
2071
148
Electromagnetic Waves
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A
2
1
ε
0
E
0
2
33%
B
2
ε
0
E
0
2
29%
C
ε
0
E
0
2
22%
D
4
1
ε
0
E
0
2
17%
Solution:
Electric energy density
u
e
=
2
1
ε
0
E
r
m
s
2
E
rms
=
2
E
0
∴
u
e
=
4
1
ε
0
E
0
2