Concept explainers
Figure 32-25 represents three rectangular samples of a ferromagnetic material in which the magnetic dipoles of the domains have been directed out of the page (encircled dot) by a very strong applied Field B0. In each sample, an island domain still has its magnetic field directed into the page (encircled ×), Sample l is one (pure) crystal. The other samples contain impurities collected along lines; domains cannot easily spread across such lines.
The applied field is now to be reversed and its magnitude kept moderate. The change causes the island domain to grow. (a) Rank the three samples according to the success of that growth, greatest growth first. Ferromagnetic materials in which the magnetic dipoles are easily changed are said to be magnetically soft; when the changes are difficult, requiring strong applied fields, the materials are said to be magnetically hard. (b) Of the three samples, which is the most magnetically hard?
Figure 32-25 Question 11.
Want to see the full answer?
Check out a sample textbook solutionChapter 32 Solutions
Fundamentals of Physics, Volume 1, Chapter 1-20
Additional Science Textbook Solutions
Sears And Zemansky's University Physics With Modern Physics
College Physics: A Strategic Approach (3rd Edition)
Glencoe Physical Science 2012 Student Edition (Glencoe Science) (McGraw-Hill Education)
College Physics: A Strategic Approach (4th Edition)
Conceptual Physical Science (6th Edition)
An Introduction to Thermal Physics
- A long, solid, cylindrical conductor of radius 3.0 cm carries a current of 50 A distributed uniformly over its cross-section. Plot the magnetic field as a function of the radial distance r from the center of the conductor.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_forwardA long, straight, cylindrical conductor contains a cylindrical cavity whose axis is displaced by n from the axis of the conductor, as shown in the accompanying figure. The current density in the conductor is given by J=J0k, where J0 is a constant and k is along the axis of the conductor. Calculate the magnetic field at an arbitrary point P in the cavity by superimposing the field of a solid cylindrical conductor with radius R1and current density Jonto the field of a solid cylindrical conductor with radius R2and current density J . Then use the fact that the appropriate azimuthal unit vectors can be expressed as 1=kr1and 2=kr2 to show that everywhere inside the cavity the magnetic field is given by the constant B=120J0ka , where a=r1r2 and r1=r1r1 is the position of P relative to the center of the conductor and r2=r2r2 is the position of P relative to the center of the cavity.arrow_forward
- A solid cylindrical conducting shell of inner radius a = 5.6 cm and outer radius b = 7.1 cm has its axis R(7074, .707a) aligned with the z-axis as shown. It carries a uniformly distributed current l2 = 5.1 A in the positive z- direction. An inifinte conducting wire is located along the z-axis and carries a current Ij = 2.9 A in the S(ód, 6d), Pao negative z-direction. 1) What is By(P), the y-component of the magnetic field at point P, located a distance d = 31 cm from the origin along the x-axis as shown? 1.419*10^(-6) Submit 2) What is B. di where the integral is taken along the dotted path shown in the figure above: first from point P to point R at (x,y) = (0.707d, 0.707d), and then to point S at (x,y) = (0.6d, 0.6d). 3.454*10^(-7) T-m Submit 3) What is By(T), the y-component of the magnetic field at point T, located at (x,y) = (-6 cm,0), as shown? T Submit 4) What is B. dl R(7074, 707d) where the integral is taken on the straight line path from point S to point P as shown? Pcao T-m…arrow_forwardA permanent magnet alloy of samarium and cobalt has magnetization M 7.5 x 10 J/T. m. Consider two magnetized spheres of this alloy each 1 cmn in radius and magnetically stuck together with unlike poles touching, What force must be applied to separate them? O 37 N O 18.5 N O 74 N O 9.3 N O 111 Narrow_forwardA steady current I flows through a long cylindrical wire of radius a. Find the magnetic field B inside and outside the cylinder if the current is:a) Uniformly distributed on the outer surface of the wire.b) Distributed in a way that the current density J = k r (k is a constant and r is a distance from the axisarrow_forward
- A particle of mass m = 1.5 x 10-16 kg and charge q = 2.3 × 10-16 C first accelarates under a potential difference of V = 103 V then enters a uniform magnetic field of a magnetic field vector directed vertically to the path of the particle. It is observed that the particle comes out of the uniform B field region in the reverse direction with a trajectory paralell to the original path which is shifted by Ax as seen in the figure below. It is measured that the particle spends 2.5 × 10-3 s in the magnetic field region. (a) What is the shift Ax for the trajectory? (b) What is the magnitude and direction of the magnetic field? (c) Now a second charged particle of unkown mass and charge Q = 8.5 x 10-15 C enters the same magnetic field region under the same accelerating potential. It is then observed that the radius of the trajectory of the particle in the magnetic field region is 3 x 10-² m. What is the mass of the particle? uniformm B field regian (d) Finally, a third particle of the same…arrow_forwardThere is a cross section across the diameter of a long, solid, cylindrical conductor. The radius of the cylinder is r=7 cm. A current of 3 A is uniformly distributed through the conductor and is flowing out of the page. Calculate the direction and the magnitude of the magnetic field at point (a)which located 3 cm far away from the center.Multi Line Text.arrow_forwardThe figure below shows a cross section of a long cylindrical conductor of radius a= 4.07 cm containing a long cylindrical hole of radius b - 1.55 cm. The central axes of the cylinder and hole are parallel and are distance d= 2.02 cm apart; current i- 5.28 A is uniformly distributed over the tinted area. (a) What is the magnitude of the magnetic field at the center of the hole? (b) What is the magnitude if b 0? (c) What is the magnitude if d 0?arrow_forward
- A magnet with a constant magnetization M = M2 is placed in the region z < 0. The H-field makes an angle 0 with the z-axis. Find the magnitude and direction of the magnetic field B outside the magnet.arrow_forwardA solid cylindrical conducting shell of inner radius a = 5.6 cm and outer radius b = 7.1 cm has its axis R(7074, .707d) aligned with the z-axis as shown. It carries a uniformly distributed current l2 = 5.1 A in the positive z- direction. An inifinte conducting wire is located along the z-axis and carries a current I1 = 2.9 A in the Scód, 6d) P(40) negative z-direction. 1) What is By(P), the y-component of the magnetic field at point P, located a distance d = 31 cm from the origin along the x-axis as shown? Submit 2) What is B- di where the integral is taken along the dotted path shown in the figure above: first from point P to point R at (x,y) = (0.707d, 0.707d), and then to point S at (x,y) = (0.6d, 0.6d). T-m Submit 3) What is By(T), the y-component of the magnetic field at point T, located at (x,y) = (-6 cm,0), as shown? T Submit 4) What is P B- di R(7074, .707d) where the integral is taken on the straight line path from point S to point P as shown? P(40) T-m Submitarrow_forwardA compact sphere of radius R=10 cm, has a charge Q = 4x10-8 C, uniformly distributed in its volume, and rotates around its axis of symmetry with a constant angular speed of w=40 rad/s. In what percentage does the intensity of the magnetic field in the center of the sphere vary, if its charge "Q" is distributed on its surface?arrow_forward
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning