The Mare on Mercury is . (Select all that apply) Group of answer choices a different chemical composition than the Mare on the Moon significantly younger than the Mare on the Moon. about the same age as the Mare on the Moon brighter (higher albedo) than the Mare on the Moon

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.