22. (II) Three point charges are arranged at the corners of a square of sidel as shown in Fig. 17-39. What is the poten- tial at the fourth corner (point A)? +Q -20 FIGURE 17-39 +3Q Problem 22.
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Three point charges are arranged at the corners of a square of side l as shown in fig. 17-39 on page 496. What is the potential at the fourth corner (point A)?
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