Question

A charged air capacitor has stored energy u० what will be the energy stored when air is replaced by a dielectric constant k charge q remaining the same

Answer 1

Answer:

When dielectric is inserted between the plates of an isolated capacitor, the charge remains the same. ... As charge remains the same, the capacitance increases, then the voltage across the capacitor must decreases. In this case the energy decreases as the expression for the energy stored in a capacitor is as follows.