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Chapter 20: Magnetic Force

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Matter & Interactions
Pages: 805 - 866
Matter & Interactions

Matter & Interactions

Book edition 4th edition
Author(s) Ruth W. Chabay, Bruce A. Sherwood
Pages 1135 pages
ISBN 9781118875865

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Illustration

26 Questions for Chapter 20: Magnetic Force

  1. Calculate the mobile electron density for nickel. A mole of nickel has a mass of 59g (0.059kg), and one mobile electron is released by each atom in metallic nickel. The density of nickel is about 8.8g/cm3, or8.8×103kg/m3

    Found on Page 805

  2. Suppose that a proton has a component of velocity parallel to the magnetic field as well as perpendicular to it (Figure 20.80). What is the effect of the magnetic field on this parallel component of the velocity? What will the trajectory of the proton look like?

    Found on Page 851

  3. An electron is moving with a speed v in the plane of the page (Figure 20.81), and there is a uniform magnetic field Binto the page throughout this region; the magnetic field is produced by some large coils that are not shown. Draw the trajectory of the electron, and explain qualitatively.

    Found on Page 851

  4. In the simple mass spectrometer shown in figure 20.101, positive ions are generated in the ion source. They are released traveling at very low speed, into the region between two accelerating plated between which there is potential difference ∆V . In the shaded region there is negligible magnetic field. The semicircle traces the path of one single charged positive ion of mass M, which travels through the accelerating plates into the magnetic field region, and hits the ion detector as shown. Determine the appropriate magnitude and direction of the magnetic field B→ , in terms of the known quantities shown in figure 20.101. Explain all steps in your reasoning.

    Found on Page 856

  5. A long solenoid with diameter 4 cm is in a vacuum, and a lithium nucleus ( 4 neutrons and 3 protons ) is in a clockwise circular orbit inside the solenoid ( Figure 20.102 ). It takes \({\bf{50ns}}\,\left( {{\bf{50 \times 1}}{{\bf{0}}^{{\bf{ - 9}}}}{\bf{s}}} \right)\) for the lithium nucleus to complete one orbit.

    Found on Page 856

  6. A long solenoid with diameter 4 cm is in a vacuum, and a lithium nucleus ( 4 neutrons and 3 protons ) is in a clockwise circular orbit inside the solenoid ( Figure 20.102 ). It takes 50ns 50×10-9s for the lithium nucleus to complete one orbit.

    Found on Page 856

  7. A current carrying wire is oriented along the y axis. It passes through a region 0.6m in which there is a magnetic field of 4.5T in the+z direction. The wire experiences a force of 14.9N in the -x directio

    Found on Page 857

  8. A copper wire with square cross section carries a conventional current I to the left (as in Figure 20.83). There is a magnetic field B perpendicular to the wire. Describe the direction of E⊥, the transverse electric field inside the wire due to the Hall effect, and explain b

    Found on Page 852

  9. In Figure 20.115 two long straight wires carrying a large conventional current I are connected by one-and-a-quarter turns of wire of radius R. An electron is moving to the right with speed v at the instant that it passes through the center of the arc. You apply an electric field E→at the center of the arc in such a way that the net force on the electron at this instant is zero. (You can neglect the gravitational force on the electron, which is easily shown to be negligible, and the magnetic field of the coil is much larger than the magnetic field of the Earth.)

    Found on Page 859

  10. In Figure 20.116 a battery with known emf=K is connected to two large parallel metal plates. Each plate has a length L and width W, and the plates are a very short distance apart. The plates are surrounded by a vertical thin circular coil of radius R containing N turns through which runs a steady conventional current I. The center of the coil is at the center of the gap between the plates. At a certain instant, a proton (charge +e, mass M) travels through the center of the coil to the right with speed v, and the net force on the proton at this instant is zero (neglecting the very weak gravitational force). What are the magnitude and direction of conventional current in the coil? Explain clearly.

    Found on Page 859

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