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

I Capacitor-Energy-Dielectric question

  1. Mar 29, 2017 #1
    Lets suppose we have a charged plate Q and It has some potential.We put some dielectric between plates the potential will decrease so does energy.My question is where this energy went ?
     
  2. jcsd
  3. Mar 29, 2017 #2

    anorlunda

    User Avatar
    Science Advisor
    Gold Member

    You should have faith in conservation of energy. Have you calculated the work required to put the dielectric between the plates?
     
  4. Mar 29, 2017 #3
    Right it goes to put the dielectric material ?
     
  5. Mar 29, 2017 #4

    cnh1995

    User Avatar
    Homework Helper

    The dielectric feels a force of attraction when it is inserted. This suggests loss of energy by the capacitor when the dielectric is fully or partially inserted in the gap.
    You need some external force to overcome this attraction and to remove the dielectric from the gap. This suggests gain of energy by the capacitor as work is being done by the external agency.
     
  6. Mar 29, 2017 #5

    anorlunda

    User Avatar
    Science Advisor
    Gold Member

    Without doing calculations, you know it goes somewhere. What other possibilities are there?
     
  7. Mar 29, 2017 #6
    Theres no other possbility I think
     
  8. Mar 29, 2017 #7

    anorlunda

    User Avatar
    Science Advisor
    Gold Member

    You answered your own question.:smile:
     
  9. Mar 29, 2017 #8
    OK thanks both of you
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Capacitor-Energy-Dielectric question
Loading...