What is the velocity of a beam of electrons that go undeflected when passing through crossed electric and magnetic fields of magnitude 1.4x10^4 v/m and 2.93x10^-3 t, respectively?

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.