일반물리학 2 — Capacitance: Problem 10

10 A parallel-plate air-filled capacitor having area 40 cm\(^2\) and plate spacing 1.0 mm is charged to a potential difference of 500 V. Find (a) the capacitance, (b) the magnitude of the charge on each plate, (c) the stored energy, (d) the electric field between the plates, and (e) the energy density between the plates.