Fundamentals of Engineering Electromagnetics 1st Edition by David Cheng

Exercise 23

A parallel-plate capacitor of width w , length L , and separation d has a solid dielectric slab of permittivity in the space between the plates. The capacitor is charged to a voltage V o by a battery, as indicated in Fig. 3-32. Assuming that the dielectric slab is withdrawn to the position shown and the switch is opened, determine the force acting on the slab.