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Homework Help: Finding the radius of a Proton's arc inside a square.

  1. Oct 19, 2015 #1
    1. The problem statement, all variables and given/known data
    This is for a practice question on an exam:

    I am able to finish the problem, if I could figure out how to find the radius of this arc the proton makes.

    2. Relevant equations
    I have nothing.

    3. The attempt at a solution
    I have tried arc length equations and just integrating the change in dx and dy, but all my answers have been nonsensical.

    I have a feeling this is very simple and I wasn't paying attention enough in Geometry back in grade school.

    Any help would be greatly appreciated.

    Attached Files:

  2. jcsd
  3. Oct 19, 2015 #2


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    Staff: Mentor

    Please write out the complete problem statement.
    Surely the radius of the arc is trivial by inspection of the image?
  4. Oct 20, 2015 #3
    I have since deduced the radius, and indeed it was trivial.

    If you are interested, in calculating the required magnetic field of this square magnet to produce such a curve in a protons path through the magnetic field, the radius is simply the side length of one side of the square.
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