For a given potential difference, does a capacitor store more or less charge with a dielectric than it does without a dielectric.

For a given potential difference across a parallel plate capacitor does a capacitor stores more or less charge with a dielectric than it does without a dielectric present between the plates?

There is an air capacitor with capacitance C, charged to a potential difference of V. If the capacitor is isolated from the battery after charging, and then a dielectric slab is inserted in between the plates of capacitor. How will the energy stored in this capacitor change?

Will a dielectric-filled capacitor store more charge or less charge than a similar air capacitor at the same potential difference?

Parallel Plate Capacitors with and without Dielectric

Parallel Plate Capacitors with and without Dielectric

A capacitor of 10 muF stores charge 10 mC at given potential difference. If capacitace of capacitor is double then find charge shared for same potential difference.

A capacitor of capacitance C is charged to potential difference V and then disconnected from the battery. The air dielectric of capacitor is replaced by another dielectric of dielectric constant K. The fractional decrease in energy of the capacitor is