Physics for Scientists and Engineers with Modern Physics
4th Edition
ISBN: 9780131495081
Author: Douglas C. Giancoli
Publisher: Addison-Wesley
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Textbook Question
Chapter 28, Problem 13P
(II) Two long straight wires each carry a current I out of the page toward the viewer, Fig. 28-35. Indicate, with appropriate arrows, the direction of
FIGURE 28–35 Problem 13.
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(II) Two long straight wires each carry a current I out of
the page toward the viewer, Fig. 20–56.
Indicate, with appropriate arrows, the direc-
tion of B at each of the points 1 to 6 in the
plane of the page. State if the field is zero
at any of the points.
I
• 4
• 2
• 5
3
FIGURE 20-56
Problem 37.
10
• 6
13. (I) Determine the direction of B for each case in
Fig. 20-53, where F represents the maximum magnetic
force on
a positively
charged particle moving
with velocity v.
F
FIGURE 20–53
(a)
Problem 13.
(b)
(c)
Three particles, a, b, and c, enter a magnetic field and
follow paths as shown in
Fig. 20–48. What can you
say about the charge on
each particle? Explain.
a, b, c
FIGURE 20-48
Question 10.
Chapter 28 Solutions
Physics for Scientists and Engineers with Modern Physics
Ch. 28.1 - In Example 2510 we saw that a typical lightning...Ch. 28.1 - Suppose both I1 and I2 point into the page in Fig....Ch. 28.4 - Prob. 1CECh. 28 - The magnetic field due to current in wires in your...Ch. 28 - Compare and contrast the magnetic field due to a...Ch. 28 - Two insulated long wires carrying equal currents I...Ch. 28 - Prob. 4QCh. 28 - A horizontal current-carrying wire, free to move...Ch. 28 - (a) Write Ampres law for a path that surrounds...Ch. 28 - Suppose the cylindrical conductor of Fig. 2811a...
Ch. 28 - Explain why a field such as that shown in Fig....Ch. 28 - Prob. 9QCh. 28 - Use the Biot-Savart law to show that the field of...Ch. 28 - Prob. 11QCh. 28 - Why does twisting the lead-in wires to electrical...Ch. 28 - Compare the Biot-Savart law with Coulombs law....Ch. 28 - How might you define or determine the magnetic...Ch. 28 - How might you measure the magnetic dipole moment...Ch. 28 - A type of magnetic switch similar to a solenoid is...Ch. 28 - A heavy magnet attracts, from rest, a heavy block...Ch. 28 - Will a magnet attract any metallic object, such as...Ch. 28 - An unmagnetized nail will not attract an...Ch. 28 - Prob. 20QCh. 28 - Prob. 21QCh. 28 - Prob. 22QCh. 28 - Prob. 23QCh. 28 - Two iron bars attract each other no matter which...Ch. 28 - Describe the magnetization curve for (a) a...Ch. 28 - Prob. 26QCh. 28 - (I) Jumper cables used to start a stalled vehicle...Ch. 28 - (I) If an electric wire is allowed to produce a...Ch. 28 - Prob. 3PCh. 28 - Prob. 4PCh. 28 - Prob. 5PCh. 28 - (II) An experiment on the Earths magnetic field is...Ch. 28 - Prob. 7PCh. 28 - At the location of the compass, the magnetic field...Ch. 28 - (II) A long horizontal wire carries 24.0 A of...Ch. 28 - (II) A straight stream of protons passes a given...Ch. 28 - (II) Determine the magnetic field midway between...Ch. 28 - (II) Two straight parallel wires are separated by...Ch. 28 - (II) Two long straight wires each carry a current...Ch. 28 - (II) A long pair of insulated wires serves to...Ch. 28 - (II) A third wire is placed in the plane of the...Ch. 28 - (II) A power line carries a current of 95 A west...Ch. 28 - (II) A compass needle points 28 E of N outdoors....Ch. 28 - Prob. 18PCh. 28 - (II) Let two long parallel wires, a distance d...Ch. 28 - (II) Repeat Problem 19 if the wire at x = 0...Ch. 28 - (II) Two long wires are oriented so that they are...Ch. 28 - (II) Two long parallel wires 8.20 cm apart carry...Ch. 28 - (III) A very long flat conducting strip of width d...Ch. 28 - (III) A triangular loop of side length a carries a...Ch. 28 - Prob. 25PCh. 28 - Prob. 26PCh. 28 - (I) A 2.5-mm-diameter copper wire carries a 33-A...Ch. 28 - (II) A toroid (Fig. 2817) has a 50.0-cm inner...Ch. 28 - Prob. 29PCh. 28 - (II) (a) Use Eq. 281, and the vector nature of B,...Ch. 28 - (II) A coaxial cable consists of a solid inner...Ch. 28 - (III) Suppose the current in the coaxial cable of...Ch. 28 - Prob. 33PCh. 28 - (II) A wire, in a plane, has the shape shown in...Ch. 28 - (II) A circular conducting ring of radius R is...Ch. 28 - (II) A small loop of wire of radius 1.8 cm is...Ch. 28 - Prob. 37PCh. 28 - Prob. 38PCh. 28 - Prob. 39PCh. 28 - Prob. 40PCh. 28 - Prob. 41PCh. 28 - (III) Use the result of Problem 41 to find the...Ch. 28 - (III) A wire is bent into the shape of a regular...Ch. 28 - Prob. 44PCh. 28 - Prob. 45PCh. 28 - (III) A square loop of wire, of side d, carries a...Ch. 28 - (II) An iron atom has a magnetic dipole moment of...Ch. 28 - (I) The following are some values of B and B0 for...Ch. 28 - (I) A large thin toroid has 285 loops of wire per...Ch. 28 - (II) An iron-core solenoid is 38 cm long and 1.8...Ch. 28 - Three long parallel wires are 3.5 cm from one...Ch. 28 - Prob. 52GPCh. 28 - Prob. 53GPCh. 28 - Prob. 54GPCh. 28 - Two long straight parallel wires are 15 cm apart....Ch. 28 - A rectangular loop of wire carries a 2.0-A current...Ch. 28 - Prob. 57GPCh. 28 - A long horizontal wire carries a current of 48 A....Ch. 28 - A square loop of wire, of side d, carries a...Ch. 28 - Prob. 60GPCh. 28 - Prob. 61GPCh. 28 - For two long parallel wires separated by a...Ch. 28 - Near the Earths poles the magnetic field is about...Ch. 28 - A 175-g model airplane charged to 18.0 mC and...Ch. 28 - Suppose that an electromagnet uses a coil 2.0 m in...Ch. 28 - Four hour long straight parallel wires located at...Ch. 28 - Prob. 67GPCh. 28 - A thin 12-cm-long solenoid has a total of 420...Ch. 28 - A 550-turn solenoid is 15 cm long. The current...Ch. 28 - Prob. 70GPCh. 28 - Prob. 71GPCh. 28 - Prob. 72GPCh. 28 - Prob. 73GPCh. 28 - Prob. 74GPCh. 28 - (II) A circular current loop of radius 15 cm...Ch. 28 - (III) A set of Helmholtz coils (see Problem 61,...
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- (I) A thin 12-cm-long solenoid has a total of 460 turns ofwire and carries a current of 2.0 A. Calculate the field insidethe solenoid near the center.arrow_forward(III) Two long wires are oriented so that they are perpen- dicular to each other. At their closest, they are 20.0 cm apart (Fig. 20-59). What is the magnitude of the magnetic field at a point midway between them if the top one carries a current of 20.0 A and the bottom one carries IT= 20.0 A 12.0 A? 10.0 cm B = ? 10.0 cm FIGURE 20-59 - Ig = 12.0 A Problem 43. Bottom wirearrow_forwardIn Fig. 20–47, charged particles move in the vicinity of a current-carrying wire. For each charged particle, the arrow indicates the initial direction of motion of the particle, and the + or – indicates the sign of the charge. For each of the particles, indicate the direction of the magnetic force due to the mag- netic field produced by the wire. Explain. a be FIGURE 20–47 d+ Question 9.arrow_forward
- (I) Find the force (magnitude and direction) on a proton traveling 3.72 x 105 m/s horizontally to the west in a vertically upward magnetic field of strength 1.40 T. magnitude N direction to the north to the west to the east to the southarrow_forward. (I) A vertical straight wire carrying an upward 28-A currentexerts an attractive force per unit length of 7.8 x10-4 N/mon a second parallel wire 9.0 cm away. What current(magnitude and direction) flows in the second wire?arrow_forward(II) A long pair of insulated wires serves to conduct 24.5 A of de current to and from an instrument. If the wires are of negligible diameter but are 2.8 mm apart, what is the magnetic field 10.0 cm from their midpoint, in their plane (Fig. 20-57)? Compare to the magnetic field of the Earth. I 10.0 cm FIGURE 20–57 Problems 40 and 41. 2.8 mmarrow_forward
- (II) A rectangular loop of wire is placed next to a straight wire, as shown in Fig. 20-55. There is a current of 3.5 A in both wires. Deter- 3.5 A mine the magnitude and direction of the net force on the loop. 3.5 A 3.0 cm 5.0 cm FIGURE 20-55 Problem 31. 10.0 cm-arrow_forward(III) A long copper strip 1.8 cm wide and 1.0 mm thick isplaced in a 1.2-T magnetic field as in Fig. 20–21a. When asteady current of 15 A passes through it, the Hall emf ismeasured to be 1.02µV. Determine (a) the drift velocity ofthe electrons and (b) the density of free (conducting) electrons (number per unit volume) in the copper.arrow_forwardA proton enters a uniform magnetic field that is perpen- dicular to the proton's velocity (Fig. 20–51). What happens to the kinetic energy of the proton? (a) It increases. (b) It decreases. (c) It stays the same. (d) It depends on the velocity direction. (e) It depends on the B field direction. FIGURE 20-51 MisConceptual Question 9.arrow_forward
- (II) A straight stream of protons passes a given point inspace at a rate of 2.5 x 109 proton/s What magnetic fielddo they produce 1.5 m from the beam?arrow_forwardMagnetic fields are very useful in particle accelerators for “beam steering"; that is, the magnetic fields can be used to change the direction of the beam of charged particles without altering their speed (Fig. 20-65). Show how this could work with a beam of protons. What happens to protons that are not moving with the speed for which the magnetic field was designed? If the field extends over a region 5.0 cm wide and has a magnitude of 0.41 T, by approximately what angle 0 will a beam of protons traveling at 2.5 x 10° m/s Magnet be bent? Evacuated tubes, inside of which the protons move with velocity indicated by the green arrows FIGURE 20-65 Problem 75.arrow_forward(II) Determine the magnetic field midway between twolong straight wires 2.0 cm apart in terms of the current I inone when the other carries 25 A. Assume these currentsare (a) in the same direction, and (b) in opposite directions.arrow_forward
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