1. Jan 30, 2015 #1

   H.D. M A K

   

   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

    

   H.D. M A K, Jan 30, 2015
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3. Jan 30, 2015 #2

   mfb

   

   Insights Author

   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?

    

   mfb, Jan 30, 2015
4. Jan 30, 2015 #3

   Quantum Defect

   

   Homework Helper

   Gold Member

   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?

    

   Quantum Defect, Jan 30, 2015
5. Feb 2, 2015 #4

   Mark44

   

   Insights Author

   Staff: Mentor

   @H.D. M A K , I split off your other question, and moved it to https://www.physicsforums.com/threads/when-magnitude-of-addition-is-equals-to.795617/.

    

   Last edited: Feb 2, 2015

   Mark44, Feb 2, 2015

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