Download Chapter 24 Magnetic Fields and Forces

Chapter 24 Magnetic Fields and Forces
Thursday, March 11, 2010
8:26 PM
Ch24P Page 1
Ch24P Page 2
Ch24P Page 3
Ch24P Page 4
Ch24P Page 5
Ch24P Page 6
Ch24P Page 7
Ch24P Page 8
Ch24P Page 9
Ch24P Page 10
http://electronics.howstuffworks.com/speaker5.htm
Ch24P Page 11
Magnetic Fields Exert Torques on Current Loops
Slide 24-42
Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-W esley.
Ch24P Page 12
Ch24P Page 13
CP 24 Problem 24.23 describes two particles that orbit
the earth's magnetic field lines. Calculate the frequency of
the circular orbit for (a) an electron with speed 1.0 × 106
m/s, and (b) a proton with speed 5.0 × 104 m/s. (The
strength of the earth's magnetic field is approximately
5.0 × 10-5 T.)
Ch24P Page 14
CP 26 A mass spectrometer similar to the one in Figure 24.36
is designed to separate protein fragments. The fragments are
ionized by the removal of a single electron, then they enter a
0.80 T uniform magnetic field at a speed of 2.3 × 105 m/s. If a
fragment has a mass that is 85 times the mass of the proton,
determine the distance between the points where the ion
enters and exits the magnetic field.
Ch24P Page 15
enters and exits the magnetic field.
CP 45 The two 10-cm-long parallel wires in the figure are
separated by 5.0 mm. For what value of the resistor R will the
force between the two wires be 5.4 × 10-5 N?
Ch24P Page 16
CP 47 An electron travels with a speed of 1.0 × 107 m/s
between two parallel charged plates, as shown in the figure.
The plates are separated by 1.0 cm and are charged by a 200 V
battery. What magnetic field strength and direction will allow
the electron to pass between the plates without being
deflected?
Ch24P Page 17
CP 56 A 1.0-m-long, 1.0-mm-diameter copper wire carries a
current of 50.0 A towards the East. Suppose we create a
magnetic field that produces an upward force on the wire
exactly equal in magnitude to the wire's weight, causing the
wire to "levitate." What are the magnetic field's magnitude
and direction?
Ch24P Page 18
Ch24P Page 19