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When magnitude of addition is equals to

  1. Jan 30, 2015 #1
    When magnitude of addition is equals to the magnitude of difference of two vectors then the angle between them will be 90 degrees.... How and Why ??? can anyone explain it ??
    Any help will be appreciated..
    Thanks
     
  2. jcsd
  3. Jan 30, 2015 #2

    mfb

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    2016 Award

    Staff: Mentor

    Did you draw a sketch? Can you express the magnitude of the sum and the difference in terms of their individual magnitudes and the angle?
     
  4. Jan 30, 2015 #3

    Quantum Defect

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    Think about two vectors: (a1, b1, c1, ...) and (a2, b2, c2, ....)
    What are the magnitudes of the sum and difference of these two vectors? Set these two equations equal to each other and simplify.
    What is the scalar (dot) product of the two vectors? How is this related to the result from the first part?
     
  5. Feb 2, 2015 #4

    Mark44

    Staff: Mentor

    Last edited: Feb 2, 2015
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