A uniform electric field of 3.50 kN/C points in the x direction. 1) What is the change in potential energy of a 2.00 nC test charge, Uelectric, b - Uelectric, a, as it is moved from point a at x = -30.0 cm to point b at x = 50.0 cm? The same test charge is released from rest at point a. What is its kinetic energy when it passes through point b? (Express your answer to two significant figures.) if a negative charged instead of a positive charge were used in this problem qualitatively how would your answers change?
