Value of current for the lower wire to levitate upper wire

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Two identical wires with a weight of 4.95E+4 N/m, are located one above the other, in a vertical plane above the surface of the earth. The wires are aligned north-south so that the earths's magnetic field will not affect them. Assume the distance of separation is 0.07 m and that they will carry the same current, but in opposite directions. What must be the value of the current for the lower wire to levitate the upper wire? 

Reference no: EM13651057

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