In order to fully understand an author's message, the reader must first A. identify the climax and the actions leading up to it
B. identify the characters and their motivation
C. identify the tone of the introduction
D. identify the topic and its impact on human kind

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.