A uniform electric field of 6.00 kN/C points in the +x-direction. What is the change in potential energy U(electric,b)−U(electric,a) of a +6.00 nC test charge as it is moved from point a at x=−30.0 cm to point b at x=50.0 cm? U(electric,b)−U(electric,a)= The same test charge is released from rest at point a. What is its kinetic energy Kb when it passes through point b? Kb=

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A: Charge q = -41.8μC=-41.8×10-6C              θ=55.2° The electric field E = 9.82 N/C