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Homework Help: Power Supply to Point Charge

  1. Aug 4, 2012 #1
    1. The problem statement, all variables and given/known data
    In lab we did an experiment where there was a 12v D.C. power supply in a glass dish filled with water. We set the + and - terminals in the dish and a piece of graph paper underneath. With a volt-meter we hunted for certain electric potentials such as 2V, 4V, 0V, etc and wrote down the co-ordinates. This was then plotted, and we were told to draw the electric field. Basically a dipole. No big deal.

    Then the professor offered us a lucrative opportunity for extra-credit which I can't resist because the class is difficult and I want to learn how to do things like this. The question is: For what charge Q could replace the 12V power source. This was all fine and dandy but I am sure I've made a mistake somewhere in my math. Not asking for an answer by the way. Any hints or ideas would be greatly appreciated!

    2. Relevant equations
    ∇V = -E

    3. The attempt at a solution
    See attached files.

    Edit by the way: I only show my result for the i vector componant because I did the Y similarly. I later took the magnitude of the resultant q vector for my answer.

    Attached Files:

    • p1.png
      File size:
      19.5 KB
    • p2.png
      File size:
      12.2 KB
  2. jcsd
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