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Capacitors with dielectrics

  1. Mar 8, 2012 #1
    1. The problem statement, all variables and given/known data
    When a dielectric is inserted in a capacitor, why does the charge remain unchanged while the potential decreases and capacitance increase?

    2. Relevant equations

    3. The attempt at a solution
    i'm not really about this one, but is it because the charges accumulate on the surface area and since surface area doesn't change after an insertion of a dielectric, the charges won't change since area didn't change? But then again.... Capacitance is a capacitors ability to hold a charge in a electric field and it increase so you can see my dilemma lol.
  2. jcsd
  3. Mar 8, 2012 #2
    O never mind there was no power source ;P but on that note, let's say if there was a power source, how would it change the answer?
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