For the configuration in Ex. 10.1, consider a rectangular box of length l, width w, and height h, situated a distance d above the yz plane (Fig. 10.2).
(a) Find the energy in the box at time t1 = d/c, and at t2 = (d + h)/c.
(b) Find the Poynting vector, and determine the energy per unit time flowing into the box during the interval t1 < t < t2.
(c) Integrate the result in (b) from t1 to t2, and confirm that the increase in energy (part (a)) equals the net influx.
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