Three identically charged spheres A, B, and C, each with a charge of +3.0 * 10-7 C, are located at the corners of a triangle whose sides are 30 cm long and all the angles are 60 deg. What is the net force acting on sphere A? I figured the X coordinates cancel each other out. For the Y: kqAqB/r^2 cos 30 + kqAqC/r^2 cos 30 since all charges and sides are equal: 2(kq^2/r^2) cos 30 the answer I get is 1.56 *10^-2 but the website says that is not correct. Does anyone know what I am doing wrong??