The figure shows three long wires with a linear mass density of 50 g/m. The two lower wires are 4 cm apart and carry equal currents I, and the third wire carries the return current for both lower wires. The current I is chosen such that the upper wire “floats” 1 cm above the plane of the other two wires. What is the current I that will allow the upper wire to hover 1 cm above the other wires?

Transcribed Image Text:

21 2 cm 2 cm 21 2 cm 2 cm

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