Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Capacitors with Dielectrics

  1. Mar 3, 2008 #1
    For a capacitor not connected to a battery, why does the voltage decrease with the insertion of a dielectric. Would it be because the net electric field between the conductors is decreased?
  2. jcsd
  3. Mar 3, 2008 #2
    you just answered your own question. there is also less room for particles to lose potential over.
  4. Mar 4, 2008 #3


    User Avatar
    Science Advisor
    Homework Helper

    Gear300, your answer is a lot better than this one. Yes, the dielectric decreases the electric field. What do you mean "less room"???
  5. Mar 4, 2008 #4
    alternative method :

    insert a dielectric , keeping the charge accumulated unchanged. the greater the dielectric(coefficient e), the greater the capacitance and the lower the voltage across

    but why. it is related to the properties of dielectric ... and polarization makes the V decreases as well as .... that's another story
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook