This preview shows pages 1–3. Sign up to view the full content.
The Magnetic Field
Due: 11:55pm on Monday, April 25, 2011
Note:
You will receive no credit for late submissions.
To learn more, read your instructor's
Grading
Policy
[Switch to Standard Assignment
View
]
Ampère’s Law Explained
Learning Goal:
To understand Ampère’s law and its application.
Ampère’s law is often written
.
Part A
The integral on the left is
ANSWER:
Correct
the integral throughout the chosen volume.
the surface integral over the open surface.
the surface integral over the closed surface bounded by the loop.
the line integral along the closed loop.
the line integral from start to finish.
Part B
What physical property does the symbol
represent?
The positive direction of the line integral and the positive direction for the current are related by the righthand rule:
Wrap your righthand fingers around the closed path, then the direction of your fingers is the positive direction for
and the direction of
your thumb is the positive direction for the net current.
Note also that the angle the currentcarrying wire makes with the surface enclosed by the loop doesn't matter. (If the wire is at an angle, the
normal component of the current is decreased, but the area of intersection of the wire and the surface is correspondingly increased.)
ANSWER:
Correct
The current along the path in the same direction as the magnetic field
The current in the path in the opposite direction from the magnetic field
The total current passing through the loop in either direction
The net current through the loop
Part C
The circle on the integral means that
must be integrated
ANSWER:
Correct
over a circle or a sphere.
along any closed line that you choose.
along the path of a closed physical conductor.
over the surface bounded by the currentcarrying wire.
Part D
Which of the following choices of path allow you to use Ampère’s law to find
?
The path must pass through the point
.
The path must have enough symmetry so that
is constant along large parts of it.
The path must be a circle.
ANSWER:
[
Print
]
Page 1 of 12
MasteringPhysics: Assignment Print View
4/25/2011
http://session.masteringphysics.com/myct/assignmentPrintView?assignmentID=1571104
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentCorrect
a only
a and b
a and c
b and c
Part E
Ampère’s law can be used to find the magnetic field around a straight currentcarrying wire.
Is this statement true or false?
In fact Ampère's law can be used to find the magnetic field
inside
a cylindrical conductor (i.e., at a radius
less than the radius of the wire,
). In this case
is just that current inside , not the current inside
(which is the total current in the wire).
ANSWER:
Correct
true
false
Part F
Ampère’s law can be used to find the magnetic field at the center of a square loop carrying a constant current.
This is the end of the preview. Sign up
to
access the rest of the document.
 Spring '11
 JENSEN
 Physics

Click to edit the document details