Solution to task 360 from Chertov´s for extramural stud

Solution to task 360 from Chertov´s for extramural stud

360. A flat capacitor with a plate area S = 200 cm2, each charged to a potential difference U = 2 kV. The distance between the plates is d = 2 cm. The dielectric is glass. Determine the field energy W of the capacitor and the field energy density w.