Heat produced when a dielectric is inserted into a capacitor slowly

  • #1

Main Question or Discussion Point

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 **
 

Answers and Replies

  • #2
berkeman
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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 **
Looks reasonable. But remember that real batteries have finite source resistance values. How does that affect your answer?
 
  • #3
if i consider an ideal battery of no internal resistance then the heat will be zero
right??
 
  • #4
berkeman
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if i consider an ideal battery of no internal resistance then the heat will be zero
right??
I guess so. It would just take extra energy from the battery to add the extra charge.
 

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