Problem about phasors and magnitude.

Discussion in 'Homework Help' started by tadm123, Nov 24, 2013.

  1. tadm123

    Thread Starter Member

    Nov 20, 2013
    43
    0
    Problem:

    Find |A|

    A= 2e^{-j120} + 2e^{j60}


    Attempted solution:

    I basically just converted it to algebraic form and ended up with:

    A= -1-1.73j + 1+ 1.73j

    Which ended up canceling everything up.
    so,

    A= 0 and then the magintude is 0.

    -----------------
    Honestly, it sounded too easy to be true, so have I done any mistakes? If not any help would be appreciated.
     
    Last edited: Nov 24, 2013
  2. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,398
    497
    -173j + 1.73j = -171.27j
     
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  3. tadm123

    Thread Starter Member

    Nov 20, 2013
    43
    0
    Oops sorry about that. It's -1.73j + 1.73j
     
  4. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    Take a piece of paper. Draw the phasors. It's immediately obvious that they cancel each other. No maths needed.
     
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  5. tadm123

    Thread Starter Member

    Nov 20, 2013
    43
    0
    Thanks just wanted to make sure, it caught my attention that it was that simple in a bunch of very difficult problems. Again guys, thanks for the help.
     
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