Physics for Scientists and Engineers with Modern Physics
4th Edition
ISBN: 9780131495081
Author: Douglas C. Giancoli
Publisher: Addison-Wesley
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Chapter 28.4, Problem 1CE
To determine
The option which is true.
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26 O In Fig. 29-54a, wire 1 consists of a circular arc and two
radial lengths; it carries current = 0.50 A in the direction
indicated. Wire 2, shown in cross section, is long, straight, and per-
pendicular to the plane of the figure. Its distance from the center of
the arc is equal to the radius R of the arc, and it carries a current iz
that can be varied. The two currents set up a net magnetic field B at
the center of the arc. Figure 29-54b gives the square of the field's
magnitude B plotted versus the square of the current iB. The verti-
cal scale is set by B; = 10.0 x 10-10 T?. What angle is subtended by
the arc?
B?
(A)
(a)
(b)
(L. 01-01) A
A small but rigid U-shaped wire carrying a 5.0-A current
(Fig. 20-62) is placed inside a solenoid. The solenoid is
15.0 cm long and has 700 loops of wire, and the current
in each loop is
7.0 A. What is the
+I= 5.0 A
net force on the
U-shaped wire?
I.
FIGURE 20-62
В
Problem 66.
Two long straight aluminum wires, each of diameter 0.42 mm,
carry the same current but in opposite direc-
tions. They are suspended by 0.50-m-long
strings as shown in Fig. 20-67. If the
suspension strings make an angle of 3.0°
with the vertical and are hanging freely,
6.0°
what is the current in the wires?
FIGURE 20-67
Problem 78.
-0.50 m-
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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- The accompanying figure shows a cross-section of a long, hollow, cylindrical conductor of inner radius r1= 3.0 cm and outer radius r2= 5.0 cm. A 50-A current distributed uniformly over the cross-section flows into the page. Calculate the magnetic field at r = 2.0 cm. r = 4.0 cm. and r = 6.0 cm.arrow_forwardAn election moves through a uniform electric field E = (2.50i + 5.00j) V/m and a uniform magnetic field B = 0.400k T. Determine the acceleration of the electron when it has a velocity v = 10.0i m/s.arrow_forwardTwo long coaxial copper tubes, each of length L, are connected to a battery of voltage V. The inner tube has inner radius o and outer radius b, and the outer tube has inner radius c and outer radius d. The tubes are then disconnected from the battery and rotated in the same direction at angular speed of radians per second about their common axis. Find the magnetic field (a) at a point inside the space enclosed by the inner tube r d. (Hint: Hunk of copper tubes as a capacitor and find the charge density based on the voltage applied, Q=VC, C=20LIn(c/b) .)arrow_forward
- , (a) At what angle 0 is tlie torque on a current loop 90.0% of maximum? (b) 50.0% of maximum? (c) 10.0% of maximum?arrow_forwardThe magnetic field perpendicular to a single sire loop of diameter 10.0 cm decreases fron 0.50 T to zero. The re Is made of copper and has a diameter of 2.0 mm and length 1.0 cm. How much charge moves thrnugh the re while tt field is changing?arrow_forwardA long, straight wire lies on a horizontal table and carries a current of 1.20 μA. In a vacuum, a proton moves parallel to the wire (opposite the current) with a constant speed of 2.30 × 104 m/s at a distance d above the wire. Ignoring the magnetic field due to the Earth, determine the value of d.arrow_forward
- Wire 2 *34 O Figure 29-62 shows, in cross section, two long straight wires held against a plastic cylinder of ra- dius 20.0 cm. Wire 1 carries current 4 = 60.0 mA out of the page and is fixed in place at the left side of the cylinder. Wire 2 carries current i, = 40.0 mA out of the page and can be moved around the cylinder. At what (positive) angle 6, should wire 2 be positioned such that, at the origin, the net magnetic field due to the two currents has magnitude 80.0 nT? Wire 1- %3D Figure 29-62 Problem 34.arrow_forwardFour very long straight parallel wires, located at the corners of a square of side l, carry equal currents I perpendicular to the page as shown in Fig. 20-64. Determine the magnitude and direction of B at the center C of the square. -l- FIGURE 20-64 Problem 73. 3:arrow_forwardA 6.75 g wire of length L 15.0 cm is suspended by a pair of flexible leads in a uniform magnetic field of magnitude 0.440 T (Fig. 28-30). What are the (a) magnitude and (b) direction (left or right) of the current required to remove the tension in the supporting leads? Please explain the solution step by steparrow_forward
- 7) 210/31|1 y 6L →x d 2lo/3 A long wire carries a furrent 10/in the shown direction. A second wire of length 61 carrying a current Vin the direction as seen in the figure is placed at a di stan ce along y axis. The distance of the closest end of this wire from the first wire is d. What is the torque on the wire of length Sicalculated according to the axis defined by the long wire? 6L A) – (k) B)– (k) C) (k) D) 64oL (k) E) (Ê)arrow_forward62 O In Fig. 28-51a, two concentric coils, lying in the same plane, carry currents in opposite directions. The current in the larger coil 1 is fixed. Current iz in coil 2 can be varied. Figure 28-51b gives the net magnetic moment of the two-coil system as a function of iz. The vertical axis scale is set by Hnet, = 2.0 x 10-5A m², and the horizontal axis scale is set by iz, = 10.0 mA. If the current in coil 2 is then reversed, what is the magnitude of the net magnetic moment of the two-coil system when iz = 7.0 mA? A net, net,s iz (mA) (a) (b) Hnet (105 A m)arrow_forward81 SSM Figure 29-84 shows a cross section of an infinite conducting sheet carrying a current per unit x-length of A; the current emerges perpendicularly out of the page. (a) Use the Biot-Savart law and sym- metry to show that for all points P above the sheet and all points P' be- low it, the magnetic field B is parallel to the sheet and directed as shown. (b) Use Ampere's law to prove that B = uod at all points P and P'. P'. Figure 29-84 Problem 81.arrow_forward
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