(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Three charges are arranged as presented below. Q1= 5.00E-9C, Q2= 6.00E-9C and Q3= -7.00E-9C.

http://img15.imageshack.us/img15/9250/physicskf.png [Broken]

D) Find the direction of the above electric field using the polar coordinate system 0°< θ <360°

2. Relevant equations

tan θ = o/a

3. The attempt at a solution

I found my

E_{1}= 500

E_{2}= 5400

E_{3}= -700

Ex = 500 cos 18.4° + (-700) = -225.6

Ey = 500 sin 18.4° + 5400 = 5557.8

But the angle that I got was incorrect which was 24.63°.

Help anyone?

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# Homework Help: Polar coordinates of an electric field

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