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The figure shows the cross section through three long wires with a linear mass distribution of 149 g/m. They carry currents i1, i2, and i3 in the directions shown.

Wires 2 and 3 are 10.9 cm apart and are attached to a vertical surface, and each carries a current of 687 A. What current, i1, will allow wire 1 to float at a perpendicular distance d = 10.7 cm from the vertical surface?

(Neglect the thickness of the wires.) I need exact answer and solution

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