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A cross B equals zero

  1. Jul 1, 2012 #1
    A cross B equals zero is a test for orthogonal cases.

    If AxB=0 then A is perpendicular to B.
     
  2. jcsd
  3. Jul 1, 2012 #2
    Uh...is that a question?
     
  4. Jul 1, 2012 #3

    HallsofIvy

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    Science Advisor

    No, it's not. It is the dot product. If A and B are vectors, the [itex]A\cdot B= 0[/itex] if and only if they are orthogonal (perpendicular).

    You are confusing this with the fact that if A and B are any two (three dimensional) vectors, then [itex]A\times B[/itex] is perpendicular to both A and B.
     
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