ECE342 Fall 2008
Homework #4 Solution
Page 1 of 4
Name _____Solution_____
CM __111___
Due date:
Tuesday, October 7
ECE342
Homework #4 Solution
Fall 2008
(
Magnetic fields, Ampere’s law
,
induced voltage, Faraday’s law, inductance)
1
Mark each True/False as either T or F.
T
____
The units of
m
d
and d
dt
E
l
are the same.
F
____
The magnetic field intensity
H
in a volume is zero if
surface
0
B
ds
,
where the
integration is over closed surface of the volume.
T
____
At t >0, the induced voltage V(t) in the
figure on the right-hand side is positive.
2
Two infinite lines of current induce a voltage in a single loop of wire in medium
with relative permeability of
r
=6000 as shown below. (
0
=4
x10
-7
H/m)
2(a)
Find
1
, the magnetic flux produced by current I
1
. Draw its direction on the figure.
2(b)
Find
2
, the magnetic flux produced by current I
2
. Draw its direction on the figure.
2(c)
Find the actual polarity and value for the induced voltage V(t).

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