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Homework Help: Cannot make any sense out of this one

  1. May 19, 2012 #1
    1. The problem statement, all variables and given/known data
    "27 identical mercury drops are charged simultaneously to the same potential of 10 volt. What will be the potential if all the charged drops are made to combine to form one large drop? Assume all drops to be spherical."

    2. The attempt at a solution
    To be quite honest, I cannot make any sense out of the question.
  2. jcsd
  3. May 19, 2012 #2
    Each mercury drop can be assumed to be a conducting sphere(because it's a metal) and you can find their potential in terms of Q and r with the help of Gauss Law. Now, when these 27 drops are combined, the final radius R can be found, and the total charge, thereby giving you the potential of the bigger drop.
  4. May 19, 2012 #3
    thank you, that was helpful :)
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