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28. Sources of Magnetic Field
Assignment is due at 2:00am on Wednesday, March 7, 2007
Credit for problems submitted late will decrease to 0% after the deadline has passed.
The wrong answer penalty is 2% per part. Multiple choice questions are penalized as described in the online help.
The unopened hint bonus is 2% per part.
You are allowed 4 attempts per answer.
B-Field from Moving Charges
Magnetic Field near a Moving Charge
A particle with positive charge
is moving with speed
along the
z
axis toward positive
. At the time of this problem it is located at the origin,
. Your task is to find the magnetic field
at various locations in the three-dimensional space around the moving charge.
Part A
Which of the following expressions gives the magnetic field at the point
due to the moving charge?
A.
B.
C.
D.
ANSWER:
Answer not displayed
Part B
Find the magnetic field at the point
.
Part B.1
Find the magnetic field direction
Part not displayed
Express your answer in terms of
,
,
, and
, and use
,
, and
for the three unit vectors.
ANSWER:
=
Answer not displayed
Part C
Find the magnetic field at the point
.
Express your answer in terms of
,
,
,
, and
, and use
,
, and
for the three unit vectors.
ANSWER:
=
Answer not displayed
Part D
Find the magnetic field at the point
.
Part D.1
Evaluate the cross product
Part not displayed
Part D.2
Find the distance from the charge
Part not displayed
Express your answer in terms of
,
,
,
,
, and
, and use
,
, and
for the three unit vectors.
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