1. The problem statement, all variables and given/known data In the figure, the net electrostatic force on charge Q2 is zero. If Q1 = -5 nC and Q2 = +7 nC, determine the magnitude of Q0. http://www.webassign.net/bauerphys1/21-p-079-alt.gif 2. Relevant equations F = (k*q1*q2)/d^2 3. The attempt at a solution I notice that Fnetx and Fnety for Q2 are the same. So I write, Fq1*cos(theta) + Fq1 sin(theta) - Fq0(.707) = 0 k*q1*q2/d^2*(cos(theta) + sin(theta)) = k*q2*q0/x^2*(.707) then after some algebra I get, [q1*x^2*(cos(theta) + sin(theta))]/(d^2*.707) = Q0 I am questioning my method here, but this is what I have done so far.