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1
1.A conductor consists of a circular loop of radius R and two straight, long sections
as shown in the figure. The wire lies in the plane of the paper and carries a current
I. Find an expression for the vector magnet field at the center of the loop.
Step 1, formulas or related concepts.]
line:
and
loop:
Step 2, known quantities.
The wire lies in the plane of the paper and carries a current I
Step 3, direct application of the formulas/concept or the
condition to form an equation.
0
0
0
(1
)
2
2
2
loop
line
I
I
I
B
B
B
R
R
R
μ
π
+
=
+
=
+
=
HW7Key
Step 4, vector involved?
Yes
Step 5, unit in the final answer correct? Answered all were
asked?
Yes, All questions answered.
The direction of B is away from you and go into the paper
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Step 1, formulas or related concepts.]
Step 2, known quantities.
Step 3, direct application of the formulas/concept or the
condition to form an equation.
The force on longer border on the left hand side is: (this force points to left)
HW7Key
2. Shown in the figure the current in the long, straight wire is
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 Spring '08
 Ye
 Current, Magnetism

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