the constant difference of length between a rod of aluminium ( coeficient of linear expansion is 24×10^_6) and a rod of brass (coeficient of linear expansion is 19×10^_6) is 8cm all temperatures equal. calculate the length of each rod

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.