Tutorials in Introductory Physics
1st Edition
ISBN: 9780130970695
Author: Peter S. Shaffer, Lillian C. McDermott
Publisher: Addison Wesley
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Textbook Question
Chapter 7.2, Problem 1bT
B. Make prediction for the following five situations based on what you observed in part A.
Check your answers only after you have made all five predictions.
1. The magnet is turned so that the south pole is near the wire while the battery is connected.
Prediction:
Observation:
2. The leads to the battery are reversed (consider both orientations of the magnet).
Prediction:
Observation:
3. The north pole of the magnet is held near the wire but the battery is not connected.
Prediction:
Observation:
4. The north pole of the magnet is held: (a) closer to the wire and (b) farther from the wire.
Prediction:
Observation:
5. The magnet is turned so that it is parallel to the wire while the batter)’ is connected.
Prediction:
Observation:
Resolve any discrepancies between your predictions and your observations. (Hint: Consider the vector equation for the magnetic force on a current-carrying wire in a magnetic field:
Expert Solution & Answer
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B
INSTRUCTION
Solve the following problems. ANSWER ONLY TWO OUT OF THREE QUESTIONS.
Show your complete solutions. NOT FOLLOWING OF INSTRUCTIONS will be a
deduction of 10 POINTS from the total score.
1.A proton enters a magnetic tield of flux density 1.5 Wb/m² with a vetocity of
2.0 x 107 m/s at an angle of 30° with the field. Compute the force on the
proton.
2.A steady current of 2 A in a coil of 400 turns causes a flux of 104 wb to link
(pass through) the loops of the coil. Compute the average back emf induced
in the coit it the current is stopped in 0.08 seconds.
3. A coil of 50 loops is pulled in 0.020 seconds from between the poles of a
magnet, where its area intercepts a flux of 3.1 x 10-4 Wb, to a place where the
intercepted flux is 0.10 x 10-4 Wb. Determine the average emf induced.
A scientist measuring the resistivity of a new metal
alloy left her ammeter in another lab, but she does
have a magnetic field probe. So she creates a
7.5-m-long, 2.0-mm-diameter wire of the material,
connects it to a 1.5 V battery, and measures a
4.5 mT magnetic field 1.0 mm from the surface of
the wire.
Part A
What is the material's resistivity?
Express your answer in ohm-meters with the appropriate units.
► View Available Hint(s)
p=
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xa
Xb
√x x x
x
IXI
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X.10n
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Ω·m
Can you solve the rest of the problems?
c. Calculate the magnitude of the force per unit length that wire #1 exerts on wire #2.
d. Calculate the magnitude of the force per unit length that wire #2 exerts on wire #1.
e. Write these forces per unit length in component form.
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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