Physics 1B Electric Fields: A. If you do 12J of work to push 0.001C of charge from point A to point B in an electric field, what is the voltage

Physics 1B Electric Fields:
A. If you do 12J of work to push 0.001C of charge from point A to point B in an electric field, what is the voltage difference between points A and B?
B. When the charge is released, what will be its kinetic energy as it flies back past its starting point A? What principle guides your answer?