20_InstSolManual_PDF_Part6 - 20-6 Chapter 20 20.12 Set Up v...

Info icon This preview shows page 1. Sign up to view the full content.

20.12. Set Up: and E is constant, so v B is constant. Solve: and 20.13. Set Up: Eq. (20.4) says A proton has mass and charge Solve: 20.14. Set Up: Since the particle moves perpendicular to the uniform magnetic field, the radius of its path is The magnetic force is perpendicular to both and The alpha particle has charge Solve: (a) The alpha particle moves in a circular arc of diameter (b) For a very short time interval the displacement of the particle is in the direction of the velocity. The magnetic force is always perpendicular to this direction so it does no work. The work-energy theorem therefore says that the kinetic energy of the particle, and hence its speed, is constant. (c) The acceleration is We can also use and the result of part (a) to calculate the same result. The acceleration is perpendicular to and and so is horizontal, toward the center of curvature of the particle’s path. (d) The unbalanced force is perpendicular to so it changes the direction of but not its magnitude, which is the speed.
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern