1
Physics 2213
Homework #11
Fall 2009
Due : the last recitation class of the week of November 1620
Read:
Chapter 28.128.7.
Also
c
heck Eq.(28.4) and Eq.(28.8).
Exercises and Problems
(6 problems, to be handed in) :
1.
#28.20
[Two Hikers]
2.
#28.27
[Lamp Cord Wires]
3.
#28.42
[Solenoid Design]
4.
[2 Wires]
Two long parallel straight situated at x = D and D wires carry equal electric
currents I in the same direction perpendicular to this
page, as shown.
(a)
What is the
magnetic field
at the
origin?
Please give your reasoning.
(b
)
What are the
directions
of the magnetic field at the points y = D and y =
D on the yaxis?
Please illustrate how you obtained your
answers with vector diagrams.
(c)
Find the strength of
the
magnetic field
B(y) as a function of position y for points
on the yaxis.
Let B(y) be > 0 if the magnetic field has a
component in the +xdirection and < 0 if it has a
component in the xdirection.
(d)
Draw a graph of B(y)
vs. y from y = 4D to +4D.
(e)
Where on the yaxis does
B(y) have its
maximum magnitude
?
What is this
magnitude?
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 '08
 PERELSTEIN
 Physics, Work, Magnetic Field

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