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Getting vector components

  1. Jan 26, 2008 #1
    2-dimensional components for vectors is easy if you have the magnitude and angle. x is just magnitude*cos, and y is magnitude*sin. But consider this:

    Lets say you have a point charge q at (x, y, 0). You want to find the electric field at (0, 0, z). You know that the magnitude of the field is E. I can't figure out how to find the components for E.

    I think that:

    [tex]E_{z} = \left|E\right| \frac{z}{\sqrt{x^{2}+y^{2}+z^{2}}}[/tex]

    However, I can't see what the components for [tex]E_{x}[/tex] and [tex]E_{y}[/tex] would be.
  2. jcsd
  3. Jan 27, 2008 #2


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    For the moment, ignore components relative to an origin and basis. Don't you have an explicit formula for the electromagnetic field strength vector at any given point?
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