Electric potential and electric potential energy

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  1. Electric potential energy and electric potential between parallel plates (constant E)
    There is a constant electric field of 11 500 N/C between a pair of oppositely-charged parallel plates spaced 0.0475 m apart.
    1. Find the amount of work needed to move a proton from the surface of the negative plate to the surface of the positive plate, and how much electric potential energy the proton has gained after it is moved.
    2. If a proton is held at the positive plate surface and released, find the speed of the proton when it reaches the surface of the negative plate.
    3. Find the electric potential difference between the two plates. What potential energy would a 6.00×107C6.00 \times 10^{-7} C charge have at the positive plate surface?
  2. Electric potential energy and electric potential of a point charge (non-constant E)
    Find the electric potential at each point A and B, and the potential difference between A and B. If 0.060 J of work must be done on a charge to move it from A to B, find the magnitude and polarity of the charge.