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Sinosoidal curves representing waves

  1. Oct 22, 2010 #1
    we represent electromagnetic waves by sinosoidal curves.
    magnitude of what changes sinosoidally?
    or what does that represent?
  2. jcsd
  3. Oct 22, 2010 #2
    y component of rotating unit vector in a plane. Edit: Rotating with constant angular speed, of course
  4. Oct 22, 2010 #3


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    Staff: Mentor

    The magnitude of the electric field, and the magnitude of the magnetic field. (I assume you refer to a classical electromagnetic wave.)

    We sometimes make a mathematical analogy with the x- or y- component of a rotating vector as upisoft noted.
  5. Oct 22, 2010 #4
    how can magnetic & electric field become zero & again increase?how does that happen?
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