47. (III) Use the result given in Problem 45 to find the electric field (magnitude and...

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47. (III) Use the result given in Problem 45 to find the electric field (magnitude and direction) a distance z above the center of a square loop of wire, each of whose sides has length and uniform charge per length A (Fig. 21-67). FIGURE 21-67 Problem 47. 47. (III) Use the result given in Problem 45 to find the electric field (magnitude and direction) a distance z above the center of a square loop of wire, each of whose sides has length and uniform charge per length A (Fig. 21-67). FIGURE 21-67 Problem 47.