A parallel-plate capacitor consists of two large flat plates separated by some distance. One plate is postively charged and the other is negatively charged. Suppose now that a proton is placed between the plates. To obtain the largest electric potential energy, we should place the proton
  1. near the positive plate.
  2. near the negative plate.
  3. anywhere we like, the electric potential energy will be the same.
  4. need more information.
  5. I'll tell you where you can put your proton.