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Let's say you have a charged, isolated parallel plate capacitor with a certain voltage. My book says that if you insert a dielectric, the voltage drops. However, that would require the energy between the plates to go down. What is this energy converted to?

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up vote 4 down vote accepted

The energy is used to polarize the dielectric, i.e.: Moving charges inside the dielectric.

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Thanks that makes sense – Ovi Mar 21 '13 at 20:50
what happens if the dielectric is then pulled out ? – Lucyfer Zedd Mar 7 '15 at 8:31

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