Homework Statement
q1 = 25 μC at (0,1) and q2 = 20 μC find a.) q3 if q1 is in the negative x direction
Homework Equations
E=kq1q2/r^2
The Attempt at a Solution
I keep trying to add vectors to find q3 ie ( -(25 μC) + 20 μC) and get 5 μC the book answer says 20 μC