1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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..
  2. jcsd
  3. Jan 30, 2015 #2


    User Avatar
    2017 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

    User Avatar
    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?
  5. Feb 2, 2015 #4


    Staff: Mentor

    Last edited: Feb 2, 2015
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook