Find the mass of the solid and the center of mass if the solid region in the first octant is bounded by the coordinate planes and the plane . The density of the solid is . x + y + z = 2 (x, y,z) = 4

Point charges q1=+2.00μc and q2=−2.00μc are placed at adjacent corners of a square for which the length of each side is 1.50 cm . point a is at the center of the square, and point b is at the empty corner closest to q2. take the electric potential to be zero at a distance far from both charges. part a what is the electric potential at point a due to q1 and q2? express your answer with the appropriate units.