1. The problem statement, all variables and given/known data The source charge (the magenta circle at the origin) is a positive charge. A particle whose charge is -6e-09 C is placed at location D. 1. The electric field at location D has the value < -8000, 8000, 0 > N/C. What is the unit vector in the direction of E at this location? 2. What is the electric force on the -6e-09 C charge? 3. What is the unit vector in the direction of this electric force? 2. Relevant equations E = kq/r^2 3. The attempt at a solution 1. E = sqrt ( -8000^2 + 8000^2 + 0^2) = 11300 tan^-1(-8000/8000) = 135 degrees 11300=(8.99E9)(6E-9) / r^2 r=0.07 m r(x)=0.07cos(135) = -0.05 m r(y)=0.07sin(135) = 0.05 m This is wrong. Can anyone show me how to do it? I assume you can't do #2 without knowing the value of #1, and you can't do #3 without knowing the value of #2? What exactly is question #2 and #3 asking?