A) A 3 microcoulomb charge is at the coordinates (3,4) mm. A -4 microcoulomb charge is at the coordinates (-2,5)mm. What is the force vector in polar coordinates on the 3 microcoulomb charge?
B) The 3 microcoulomb charge is removed. There is only a -4 microcoulomb charge at the coordinates (-2,5)mm. What is the Electric field vector in polar coordinates at the origin?