I have been trying to calculate the potential difference between to points. In doing so, I have tried taking [tex]\int[/tex] -E * dl, in which I end up with -E*4, but that does not include the point charge, and I'm just not sure what I need to do to Calculate the potential with the addition of the point charge. Question A uniform electric field of 8 kN/C is in the x direction. A positive point charge Q = 3 micro Coloumbs is released from rest at the origin. --What is the potential difference V(4 m) - V(0)?