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mrlucky0
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Homework Statement
Two tiny objects with equal charge of 85.0 µC are placed at two corners of a square with sides of 0.295 m, as shown. How far above and to the left of the corner of the square labeled A would you place a third small object with the same charge so that the electric field is zero at A?
Here is a drawing:
http://img177.imageshack.us/my.php?image=newbitmapimageqn1.png
Homework Equations
Coulomb's Law: F = (k * q1 * q2 ) / r^2
Electric Field: = k*q / r^2
The Attempt at a Solution
One of the force vectors (call it F1) is pure y. I decomposed the other force vector (call it F2) into it's x and y components.
Vector F1 = < 0, F1 >
Vector F2 = < F2*cos(a), F2*sin(a) >
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