Some background: This was a quiz I recently had in which I lost a few points for missing an "x & y component" for one of the directions. My thinking is that because the problem was not actually set up with a specified order of charges there are a few different answers you could get. I intend to bring this up with the teacher, but thought I'd see what you guys have to say as well. 1. The problem statement, all variables and given/known data Three charges are arranged in the shape of an equilateral triangle. (Note- no diagram is given) The charge magnitudes are as follows: q1=+4*10-6C, q2=-6.5*10-6C, q3=+2.1*10-6C The distance between each charge is 2m Calculate the electric force on q3. 2. Relevant equations F = (kq1q2) / d2 3. The attempt at a solution I set my triangle up as: (see attached picture) Calculated force of 1 on 3: F = .0189 N X-component of F13: Fx=(.0189)(sin30) =.00945 N Y-component of F13: Fy=(.0189)(cos30) =.0163676801 N *Marked Correct* Calculated force of 2 on 3: F = -.0307125 N *Marked incorrect for not separating into x & y components* Would this not be correct though? The way I set my triangle up has 2 on a straight horizontal line across from 3! My further work is just adding up all of the components of everything for a final answer of: Net Force on q3 = .0268 N @ 37.6deg SofW Thanks for any help!