A stone is hanging from a vertical scale that reads 24.1 N. A flask of water is moved up so the stone is totally submerged in the water. The vertical scale now reads 11.4 N. What is the density of the stone

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.