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Snagged a little on some vector math

  1. Feb 2, 2012 #1
    I'm learning how to calculate E-fields and, in some examples, when using the unit vector r^ with only one component (ie r^x or r^y), it is simply defined r^x=x/r. I am missing the algebra. Will anyone explain this to me? Thanks
     
  2. jcsd
  3. Feb 2, 2012 #2

    vanhees71

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    Bei definition the radial unit vector ist [itex]\hat{r}=\vec{r}/r[/itex]. In Cartesian coordinates, you have [itex]\hat{r}=(x/r,y/r,z/r)[/itex] with [itex]r=\sqrt{x^2+y^2+z^2}[/itex].
     
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