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Chapter 32: Maxwell’s Equations; Magnetism of Matter

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Fundamentals Of Physics
Pages: 941 - 971
Fundamentals Of Physics

Fundamentals Of Physics

Book edition 10th Edition
Author(s) David Halliday
Pages 1328 pages
ISBN 9781118230718

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Illustration

87 Questions for Chapter 32: Maxwell’s Equations; Magnetism of Matter

  1. The figure 32-20 shows a circular region of radiusR=3cm in which a displacement currentis directedout of the page. The magnitude of the density of this displacement current is Jd=(4A/m2)(1-r/R), where is the radial distance (r≤R).(a) What is the magnitude of the magnetic field due to displacement current at 2cm?(b)What is the magnitude of the magnetic field due to displacement current at5cm ?

    Found on Page 968

  2. A sample of the paramagnetic salt to which the magnetization curve of Fig 32-14 applies is to be tested to see whether it obeys Curie’s law. The sample is placed in a uniform 0.50T magnetic field that remains constant throughout the experiment. The magnetization M is then measured at temperatures ranging from 10 to 300K. Will it be found that Curie’s law is valid under these conditions?

    Found on Page 969

  3. The figure shows an electric field is directed out of the page within a circular region of radius R=3.00cm. The field magnitude is E=(0.500V/ms)(1-r/R)t, where tis in seconds and ris the radial distance r≤R. What is the magnitude of the induced magnetic field at a radial distance 2.00cm?What is the magnitude of the induced magnetic field at a radial distance 5.00cm

    Found on Page 967

  4. Replace the current loops of Question 8 and Fig. 32-24 with paramagnetic spheres. For each field, are (a) the magnetic dipole moment of the sphere and (b) the magnetic force on the sphere directed up, directed down, or zero?

    Found on Page 966

  5. Suppose that a parallel-plate capacitor has circular plates with a radius R=30mmand, a plate separation of 5.00mm. Suppose also that a sinusoidal potential difference with a maximum value of 150Vand, a frequency of60Hzis applied across the plates; that i

    Found on Page 967

  6. 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 X ). Sample 1 is one (pure) crystal. The other samples contain impurities collected along lines; domains cannot easily spread across such lines.

    Found on Page 966

  7. Question: A parallel-plate capacitor with circular plates of radius 40 mm is being discharged by a current of 6.0 A . At what radius (a) inside and (b) outside the capacitor, the gap is the magnitude of the induced magnetic field equal to 75% of its maximum value? (c) What is that maximum value?

    Found on Page 967

  8. Figure 32-26 shows four steel bars; three are permanent magnets. One of the poles is indicated. Through experiment ends a and d attract each other, ends c and f repel, ends e and h attract, and ends a and h attract. (a) Which ends are the north poles? (b) Which bar is not a magnet?

    Found on Page 966

  9. At what rate must the potential difference between the plates of a parallel-plate capacitor with a2.0μF capacitance be changed to produce a displacement current of1.5A?

    Found on Page 967

  10. A parallel-plate capacitor with circular plates of the radius Ris being charged. Show that, the magnitude of the current density of the displacement current is

    Found on Page 967

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