song (shs546) – Practice HW 20 – weathers – (22202)
1
This
printout
should
have
12
questions.
Multiplechoice questions may continue on
the next column or page – find all choices
before answering.
001
0.0points
The electric field between the plates of an air
capacitor of plate area 0
.
26 m
2
is changing at
a rate of 45700 V
/
m
/
s.
The permitivity of free space is 8
.
85419
×
10

12
C
2
/
N
/
m
2
.
What is Maxwell’s displacement current?
Answer in units of A.
002
0.0points
The electric field in an electromagnetic wave
(in vacuum) is described by
E
=
E
max
sin(
k x

ω t
)
,
where
E
max
=
58
N
/
C
and
k
=
8
.
2
×
10
8
m

1
.
The speed of light is 2
.
99792
×
10
8
m
/
s.
Find the amplitude of the corresponding
magnetic wave.
Answer in units of T.
003(part1of2)0.0points
What is the wavelength corresponding to a
frequency of 7
×
10
19
Hz of electromagnetic
wave in free space?
The speed of light is
2
.
99792
×
10
8
m
/
s.
Answer in units of m.
004(part2of2)0.0points
What is the wavelength corresponding to a
frequency of 6
×
10
9
Hz?
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 Spring '00
 Littler
 Light, Wavelength, Speed of light

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