Point charge in infinite closed channel. Figure 5.43 shows a hollow cavity in a conducting medium. 'The cavity is infinite in the dimension perpendicular to the plane shown.
(a) Show the location of the image charges necessary to calculate the electric field intensity inside the cavity.
(b) Use the nearest four images and the charge q to calculate an approximate value at the center of the box, in the plane shown. Place a system of coordinates so that the lower left comer of the cavity is at (0, 0).
