Question: If a dielectric is inserted in charged capacitor (battery removed), the quantity that remains consta...

Question

If a dielectric is inserted in charged capacitor (battery removed), the quantity that remains constant is

Answer 1

Solution

When the capacitor is isolated (battery removed) no charge can flow. Insertion of a dielectric increases the capacitance $C$ and reduces the potential difference $V$ according to the relation $q = CV$ . Thus the stored charge $q$ remains unchanged.