College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Transcribed Image Text:Questions
Magnetic Force
1.
Use Fleming's Left Hand Rule to predict the direction of movement of the current-carrying wire in the magnetic field
below:
2.
Consider the situation below:
| = 0.15A
%3D
L = 0.50m
63°
B = 40mT
a)
Calculate the magnitude of magnetic force experienced by the wire.
b)
The wire is placed at an angle of 0° to the magnetic field. Calculate the magnitude of magnetic force
experienced by the wire at this angle.
c)
State the angle between the magnetic field and the wire that will generate the largest magnetic force.

Transcribed Image Text:Questions Continued
3.
The diagram below shows two long, straight parallel wires. These wires are carrying current into the page.
a)
Draw the magnetic field that surrounds both wires
b)
State whether these wires are attracted or repelled by each other.
4.
State the definition of the Ampere.
A student builds a model motor. Direct current is fed through the loops of wire, which are placed within a magnetic
field as shown.
N
The motor will start to spin. Use Fleming's Left Hand Rule to determine the direction of spin.
Questions Continued
6.
A student carried out an experiment to investigate how the current through a solenoid affects the magnetic field
strength inside the solenoid. The following apparatus is used:
Solenoid
Laptop
Magnetic Field
Sensor
Data Logger
A
Variable
Power Supply
The following data is collated:
В (mT)
Average B
I (A)
ДВ (mT)
(mT)
B1
B2
Вз
0.5
0.31
0.33
0.29
0.6
0.38
0.39
0.37
0.7
0.44
0.42
0.46
0.8
0.54
0.54
0.42
0.9
0.57
0.57
0.57
1.0
0.65
0.62
0.62
a)
Complete the table to include the average value of B and AB.
b)
Plot a graph of I(A) (x-axis) against B(mT) (y-axis).
c)
The expression for the magnetic field strength inside a solenoid is:
B =
HonI
Where
Ho
is the permeability of free space and is a constant value of
Ho
= 1.257x10-6mkgs-2A-2
n is the number of turns per meter.
Use the gradient of the graph to determine the number of coils per meter for this solenoid.
EXTENSION
d)
Plot appropriate error bars and other lines of best fit to determine the error in your value for n.
SI
5.
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