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 8.1, Problem 2dT
At two later instants,
- Use Lenz’ law to determine whether the flux due to the current induced in the loop is positive, negative, or zero. Explain.
- Describe the current in the loop during this time interval.
Student 1: “The sign of the flux is the same as it was in part C. So the current here will also be counter-clockwise.”
Student 2: “I agree. If I think about the force on a positive charge on the leading edge of the loop. ¡t points towards the top of the page. That's consistent with a counter-clockwise current.”
Do you agree with either student? Explain.
Expert Solution & Answer
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Students have asked these similar questions
Learning Goal:
To understand the magnetic force on a straight current-
carrying wire in a uniform magnetic field.
What is the direction of the magnetic force acting on the wire in Part B due to the applied magnetic field?
Magnetic fields exert forces on moving charged
particles, whether those charges are moving
independently or are confined to a current-carrying
due north
wire. The magnetic force F on an individual moving
charged particle depends on its velocity v and charge
q. In the case of a current-carrying wire, many charged
particles are simultaneously in motion, so the magnetic
force denends on the total current I and the lenath of
due south
due east
O due west
Figure
O straight up
O straight down
Up
Part D
W +
Now let us assume that we are able to reorientate the wire in (Figure 1) and therefore the direction of
current flow.
S
Down
Which of the following situations would result in a magnetic force on the wire that points due north?
Check all that apply.
Problem 1
All parts of this problem refer to the circular loop of wire in the
coordinate system shown, with the z axis pointing out of the page. In each case,
you are asked to give the direction of the current induced in the loop as "Clockwise",
"Counter-clockwise", or "No current". You need not show your reasoning.
Loop at rest. B uniform, in +z (that is, k) direction, increasing in mag-
opyight 2021Princet
nitude.
b)
Loop at rest. B uniform, in -z (that is, –k) direction, decreasing in magnitude.
B =
cak with constant c > 0, constant in time, loop moving at constant velocity in +x
c)
direction.
B = crk with constant c > 0, constant in time, loop moving at constant velocity in -x
d)
direction.
crk with constant c > 0, constant in time, loop moving at constant velocity in +y
e)
direction.
%3D
Two closed loops A and C are close to a long wire carrying
a current I (Figure 1).
Part A
Find the direction (clockwise or counterclockwise) of the current induced in loop A if I is steadily decreasing.
O The current in loop A is clockwise.
O The current in loop A is counterclockwise.
O The current in loop A is zero.
Part B
Figure
1 of 1
Find the
ion (clockwise c
counterclockwise) of the
induced
loop C if I is steadily decreasing.
The current in loop C is counterclockwise.
O The current in loop C is clockwise.
O The current in loop C is zero.
A
Chapter 8 Solutions
Tutorials in Introductory Physics
Ch. 8.1 - A copper wire loop is placed in a uniform magnetic...Ch. 8.1 - Suppose that the loop is now placed in the...Ch. 8.1 - In each of the diagram below, the position of a...Ch. 8.1 - D. State whether you agree or disagree with each...Ch. 8.1 - The diagram at right shows a stationary, copper...Ch. 8.1 - To understand the interaction between the wire...Ch. 8.1 - A wire loop moves from a region with no magnetic...Ch. 8.1 - At two later instants, t=t1andt=t1+t the loop is...Ch. 8.2 - The resistance of loop 2 is greater than that loop...Ch. 8.2 - Suppose that loop 2 were replaced by a wooden...
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