Tutorials in Introductory Physics
1st Edition
ISBN: 9780130970695
Author: Peter S. Shaffer, Lillian C. McDermott
Publisher: Addison Wesley
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Chapter 7.1, Problem 1cT
The parts of a permanent magnet that interact most strongly with other materials are called the poles of a magnet.
How many magnetic poles does each of your magnets have? Explain how you found them.
How many different types of poles do you have evidence for so far? Explain.
Using three magnets, find a way to distinguish one type of pole from another.
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You have learned that a charge moving in an magnetic field can experience a
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You have learned that a charge moving in an magnetic field can experience a
magnetic force. Remarkably, anytime that a charged particle moves that
particle produces its own magnetic field! The image below of magnetic
compasses forming a circle around a current-carrying wire demonstrates the
shape of the magnetic field. The magnetic field lines forms concentric circles
around that wire. The strength of the field decreases with increasing distance
away from the wire.
If the current in the wire is 4.07A, what is the magnitude of the magnitude of
the magnetic field (in µT, or micro-Tesla) a distance of 0.53m away from the
wir
Note: It is understood that the unit of your answer is in uT, however do not
explicitly include units in your answer. Enter only a number. If you do enter a
unit, your answer will be counted wrong.
Right hand rule for magnetic field due to a long straight
current: Magnetic field lines are a way to graphically represent
I
the magnetic field. The direction of B at any point is tangent to
the field line and the magnitude of B is proportional to the
density of field lines. For the long straight wire, the magnetic
I
field lines form circles around the wire.
There is a right hand rule for the direction in the magnetic field
go around the wire. Grasp the wire with your thumb in the
direction of the current. The direction your fingers wrap around
the wire is the direction that the B field lines go around the
wire. Check that this agrees with your analysis of the long
straight wire from the previous problem.
lines
В
Magnitude of magnetic field due to a long straight current:
The magnitude of the magnetic field at a distance r due to a
very long straight wire carrying current I can be derived from
dB O
the Biot-Savart law:
HoI ds sin ø
HOID ds
dB
4π (s2+ D?) 4π(s2+ D2)3/2
D
where we used…
Chapter 7 Solutions
Tutorials in Introductory Physics
Ch. 7.1 - Investigate the objects that you have been given...Ch. 7.1 - Obtain a permanent magnet and an object that is...Ch. 7.1 - The parts of a permanent magnet that interact most...Ch. 7.2 - On an enlargement of the figure below, sketch...Ch. 7.2 - B. Make prediction for the following five...Ch. 7.2 - Suppose you place a small magnet in a magnetic...Ch. 7.2 - B. Suppose you hold a magnetic compass near a...Ch. 7.2 - Now suppose that you hold the compass at some...Ch. 7.2 - Sketch the magnetic field lines of a...Ch. 7.2 - A wire is formed into a and the leads are twisted...
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