Four identical metal spheres have charges of qa = -8.0 μc, qb=-2.0 μc, qc=+5.0 μc, and qd=+12.0 μc. (a) two of the spheres are brought together so they touch, and then they are separated. which sp

Four identical metal spheres have charges of qa = -8.0 μc, qb=-2.0 μc, qc=+5.0 μc, and qd=+12.0 μc. (a) two of the spheres are brought together so they touch, and then they are separated. which spheres are they, if the final charge on each one is +5.0 μc?