Aπ_ ("pi-minus") particle, which has charge _e, is at location ‹ 4.00 10-9, -3.00 10-9, -6.00 10-9 › m. what is the electric field at location < -3.00 10-9, 2.00 10-9, 4.00 10-9 > m, due to the π_ particle?

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.