A capacitor is charged by using a battery which is disconnected.a dielectric slab is then slipped between the plates which results in
Hi aspirant,
on inserting a dielectric slab in a charged capacitor with batteery disconnected, capacitance increases by k times, where k is dielectric constant. Value of potential difference reduces to V/k, where V is potential difference before inserting the slab and k is dielectric constant. Also the electric field increases by k times. Hope you are clear with it