Two parallel-plate capacitors are identical except that capacitor 1 has vacuum between the plates and capacitor 2 has a dielectric slab of dielectric constant \(\kappa\) filling the space between the plates. Each capacitor is isolated (that is, not connected to a battery), and they store equal quantities of charge. Compare the two based on

(a) capacitance,

(b) potential difference between the plates,

(c) energy stored, 

\((d)\) electric field magnitude between the plates, and

(e) energy density.