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Chapter 22: Magnetism

College Physics (Urone)
Pages: 779 - 816

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132 Questions for Chapter 22: Magnetism

  1. What are the signs of the charges on the particles in Figure 22.46?

    Found on Page 808
  2. An electron moving at 4.00×103m/sin a 1.25‐Tmagnetic field experiences a magnetic force of1.40×10‐16N. What angle does the velocity of the electron make with the magnetic field? There are two answers.

    Found on Page 811
  3. Which of the particles inFigure 12.47 has the greatest velocity, assuming they have identical charges and masses?

    Found on Page 808
  4. (a) A physicist performing a sensitive measurement wants to limit the magnetic force on a moving charge in her equipment to less than1.00×10‐12N. What is the greatest the charge can be if it moves at a maximum speed of30.0m/sin the Earth’s field? (b) Discuss whether it would be difficult to limit the charge to less than the value found in (a) by comparing it with typical static electricity and noting that static is often absent.

    Found on Page 811
  5. Which of the particles in Figure 22.47 has the greatest mass, assuming all have identical charges and velocities?

    Found on Page 809
  6. A cosmic ray electron moves at\({\rm{7}}{\rm{.50 \times 1}}{{\rm{0}}^{\rm{6}}}{\rm{ m/s}}\)perpendicular to the Earth’s magnetic field at an altitude where field strength is\({\rm{1}}{\rm{.00 \times 1}}{{\rm{0}}^{{\rm{ - 5}}}}{\rm{ T}}\). What is the radius of the circular path the electron follows?

    Found on Page 811
  7. While operating, a high-precision TV monitor is placed on its side during maintenance. The image on the monitor changes color and blurs slightly. Discuss the possible relation of these effects to the Earth’s magnetic field.

    Found on Page 809
  8. A proton moves at\({\rm{7}}{\rm{.50 \times 1}}{{\rm{0}}^{\rm{7}}}{\rm{ m/s}}\)perpendicular to a magnetic field. The field causes the proton to travel in a circular path of radius\({\rm{0}}{\rm{.800 m}}\). What is the field strength?

    Found on Page 811
  9. Discuss how the Hall effect could be used to obtain information on free charge density in a conductor. (Hint: Consider how drift velocity and current are related.)

    Found on Page 809
  10. (a) Viewers of Star Trek hear of an antimatter drive on the Starship Enterprise. One possibility for such a futuristic energy source is to store antimatter-charged particles in a vacuum chamber, circulating in a magnetic field, and then extract them as needed. Antimatter annihilates with normal matter, producing pure energy. What strength magnetic field is needed to hold antiprotons, moving at\({\rm{5}}{\rm{.00 \times 1}}{{\rm{0}}^{\rm{7}}}{\rm{ m/s}}\)in a circular path\({\rm{2}}{\rm{.00 m}}\)in radius? Antiprotons have the same mass as protons but the opposite (negative) charge. (b) Is this field strength obtainable with today’s technology or is it a futuristic possibility?

    Found on Page 811

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