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Homework Help: Magnetic fields

  1. Dec 9, 2007 #1
    1. The problem statement, all variables and given/known data

    A proton enters a uniform magnetic field of strength B. Sketch it subsequent motion and derive an expression for the time, t, spent in the magnetic field.

    2. Relevant equations

    [tex]F=qvB=mv^{2}\div r[/tex]

    3. The attempt at a solution

    I calculated the period of the particle in the field as:

    [tex]T= 2 \pi m\div qB[/tex]

    I don't know if this is what they want or if there's a way to calculate the total time.
    Last edited: Dec 9, 2007
  2. jcsd
  3. Dec 14, 2007 #2

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    Last edited by a moderator: Apr 23, 2017
  4. Dec 14, 2007 #3


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    A charged particle will spend 1/2 period in a magnetic field (assuming it's constant) when it enters at the boundary from a region without the magnetic field.
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