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Magnetic field due to current in parallel wires

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A long horizontal wire carries a current of It = 49.4 A. A seond wire (I), made of 2.30mm diameter copper wire and parallel to the first but L=17.6cm below it, is held in suspension magnetically. What is the current in the lower wire? use right as positive direction.

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The expert calculates the current in the lower wire.

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Force per unit length between the two wires due to magnetic field of current= (Mu 0 i1 i2 / 2 pi d)

where i1 , i2 are the currents
d is the distance between the wires

This force will support the weight of the ...

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