The fact that mercury has no atmosphere is evidence that it

is much farther from the sun than it appears
is composed almost entirely of gases
reflects almost all of the sunlight that strikes it
reflects a small percentage of the sunlight that strikes it

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.