Chapter 30: Charges and Currents in Magnetic Fields

Study Plan

The “cyclotron” was one of the first devices used to accelerate protons to very high kinetic energy. The protons are accelerated inside the circular evacuated can placed between the poles of the large electromagnet.

In this chapter we will see that in a uniform magnetic field, such as between the pole faces of the electromagnet shown, a charged particle travels in a circular orbit. We will ask questions such as:

  • How does a cyclotron accelerate protons? (Section 30.1, page 967)
  • The first cyclotron used a magnetic field of 1.4 T. What kinetic energy of the protons could be attained? What was the frequency of the circular motion? (Example 1, page 968)
  • An iron-core electromagnet was used to provide the large magnetic field. What is the magnetic field produced solely by the wire coil around the iron core? (Example 6, page 979)

Organize

  1. Prepare for lecture by reading the assigned sections from Chapter 30 in your textbook or ebook. This will provide an organizing framework for concepts introduced in lecture, and help you take better notes.
  2. Take the checkup quiz and work the Checkup questions in your textbook to assess your understanding of basic concepts. Take note of any topics you need to review further.
  3. Review the Examples from your textbook. These progress from simple to complex, and provide concrete illustrations of the concepts discussed.

Learn

  1. Re-read Chapter 30 and review your lecture notes.
  2. Access the Online Concept Tutorials given for this chapter. Tutorials use animation and interactive exercises to help develop your understanding of fundamental topics.
  3. Use the FlashCards to test your memory for new key terms and equations.
  4. Work the end of chapter Problems and Review Problems assigned by your instructor. If your instructor has assigned SmartWork online homework, login from the right navigation pane.

Connect

  1. Throughout the text Physics in Practice boxes explore real-world applications of core concepts in specific detail. In Chapter 30 see:
    Concept in Context Physics in Practice: Magnetic Recording Media
  2. Physics in the News offers additional real-world physics applications, and a daily dose of science-based news.

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Organize

Learn

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