yoon (jey283) – Ch18-h4 – turner – (56545)
1
This
print-out
should
have
29
questions.
Multiple-choice questions may continue on
the next column or page – find all choices
before answering.
001(part1of6)5.0points
Conventional current flows through the ring
shown in the figure below in such a way that
if you stand at location A on the +
x
axis
and look towards the ring, current appears to
be flowing clockwise. The ring lies in the
yz
plane, encircling the
x
axis.
x
z
y
A
B
C
D
E
F
What is the direction of the magnetic field
due to the ring at A?
1.
ˆ
B
A
=
(
0
,
−
1
,
0
)
2.
ˆ
B
A
=
(
0
,
1
,
0
)
3.
ˆ
B
A
=
(
0
,
0
,
1
)
4.
ˆ
B
A
=
(
1
,
0
,
0
)
5.
ˆ
B
A
=
(
0
,
0
,
−
1
)
6.
ˆ
B
A
=
(−
1
,
0
,
0
)
002(part2of6)5.0points
At B?
1.
ˆ
B
B
=
(−
1
,
0
,
0
)
2.
ˆ
B
B
=
(
0
,
−
1
,
0
)
3.
ˆ
B
B
=
(
0
,
0
,
1
)
4.
ˆ
B
B
=
(
1
,
0
,
0
)
5.
ˆ
B
B
=
(
0
,
1
,
0
)
6.
ˆ
B
B
=
(
0
,
0
,
−
1
)
003(part3of6)5.0points
At C?
1.
ˆ
B
C
=
(
0
,
−
1
,
0
)
2.
ˆ
B
C
=
(
0
,
0
,
1
)
3.
ˆ
B
C
=
(
0
,
1
,
0
)
4.
ˆ
B
C
=
(
1
,
0
,
0
)
5.
ˆ
B
C
=
(
0
,
0
,
−
1
)
6.
ˆ
B
C
=
(−
1
,
0
,
0
)
004(part4of6)5.0points
At D?
1.
ˆ
B
D
=
(
0
,
1
,
0
)
2.
ˆ
B
D
=
(
0
,
0
,
−
1
)
3.
ˆ
B
D
=
(
0
,
0
,
1
)
4.
ˆ
B
D
=
(−
1
,
0
,
0
)
5.
ˆ
B
D
=
(
1
,
0
,
0
)
6.
ˆ
B
D
=
(
0
,
−
1
,
0
)
005(part5of6)5.0points
At E?
1.
ˆ
B
E
=
(
0
,
0
,
−
1
)
2.
ˆ
B
E
=
(
1
,
0
,
0
)
3.
ˆ
B
E
=
(
0
,
0
,
1
)
4.
ˆ
B
E
=
(−
1
,
0
,
0
)
5.
ˆ
B
E
=
(
0
,
1
,
0
)
6.
ˆ
B
E
=
(
0
,
−
1
,
0
)
006(part6of6)5.0points