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How does a 'open surface' of a closed loop look like?

  1. Jul 11, 2011 #1
    im on the topic of electricity and magnetism, and came across walter lewin's lecture.

    i cannot visualise how the 'open surface' of this solenoid will look like


    is the open surface a riemann surface? or something else?

    [PLAIN]http://wiki-images.enotes.com/thumb/b/b5/Riemann_sqrt.jpg/180px-Riemann_sqrt.jpg [Broken]

    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Jul 12, 2011 #2
    I believe the correct terminology is helicoid.

    A Riemann surface is something else entirely. I'm not a mathematician, but as I understand it, a Riemann surface is just a way to visualize different branches of a function and how they are related to each other.
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