# Problem about phasors and magnitude.

Joined Nov 20, 2013
43
Problem:

Find |A|

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

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:

#### shteii01

Joined Feb 19, 2010
4,644
Problem:

Find |A|

A= 2e^(-120j) + 2e^(60j)

Attempted solution:

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

A= -1-173j + 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. thanks
-173j + 1.73j = -171.27j

• Joined Nov 20, 2013
43
Oops sorry about that. It's -1.73j + 1.73j

#### t_n_k

Joined Mar 6, 2009
5,455
Take a piece of paper. Draw the phasors. It's immediately obvious that they cancel each other. No maths needed.

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