Question

What happens to energy when dielectric is placed in capacitor

Answer 1

The capacitor is charged, and isolated so the charge on the plates is constant. Inserting a dielectric increases the capacitance, reducing the energy stored in the capacitor. ... The capacitor actually does work to pull the dielectric in between the plates, reducing the stored energy.

Answer 2

The capacitor is charged, and isolated so the charge on the plates is constant. Inserting a dielectric increases the capacitance, reducing the energy stored in the capacitor. ... The capacitor actually does work to pull the dielectric in between the plates, reducing the stored energy.