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What type of coordinate system?

  1. Aug 2, 2015 #1
    This is a very basic question, but what type of coordinate system is this?

    When is it useful to use?

    er, eθ, eΦ sinθ
  2. jcsd
  3. Aug 2, 2015 #2


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    Those notations are typically used for the so-called (curvilinear) spherical coordinate system. It's useful when the system to be described has a pronounced spherical symmetry, for example our earth's magnetic field, electric field due to a charges sphere, and hydrogen atom. By the way what is that ##\sin\theta## for?
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