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

I Heat produced when a dielectric is inserted into a capacitor slowly

  1. Feb 4, 2017 #1
    if a capacitor is connected to a battery and then it is fully charged . then a dielectric slab of k is inserted in the capacitor while the battery is still connected SLOWLY
    my question is will there be any heat produced??

    my approach -- after insertion of dielectric , the charge on the capacitor increases so battery must do work and a result current must flow. so heat produced = energy produced by cell - increase in potential energy in capacitor.

    my clarify **
     
  2. jcsd
  3. Feb 4, 2017 #2

    berkeman

    User Avatar

    Staff: Mentor

    Looks reasonable. But remember that real batteries have finite source resistance values. How does that affect your answer?
     
  4. Feb 5, 2017 #3
    if i consider an ideal battery of no internal resistance then the heat will be zero
    right??
     
  5. Feb 5, 2017 #4

    berkeman

    User Avatar

    Staff: Mentor

    I guess so. It would just take extra energy from the battery to add the extra charge.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted