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## Homework Statement

Point charge Q1 = 25nC located at P1(4,-2,7) and a charge Q2 = 60 nC be at P2(-3,4,-2). At what point on the y-axis is Ex=0?

## Homework Equations

E= [ Q / (4*pi*E0*r*r) ] ar

## The Attempt at a Solution

I took:

( Q1 / 4*pi*E0*(x*x+y*y+z*z) * (y / sqrt(x*x+y*y+z*z)) ay

I got -6.51.

The solution is -6.89.

Am I way off base or on the right path? Thanks for your help.