The structure shown in Fig. 26.50 is made from conducting rods. The upper horizontal rod (mass 22 g, length 95 cm) is free to slide vertically on the uprights while maintaining electrical contact. A battery connected across the insulating gap at the bottom of the left-hand upright drives 66 A through the structure. At what height h will the upper wire be in equilibrium?

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h Gap -1 = 95 cm FIGURE 26.50 Problem 80