A wire with a weight per unit length of 0.079 N/m is suspended directly above a

Question

A wire with a weight per unit length of 0.079 N/m is suspended directly above a second wire. The top wire carries a current of 31.0 A and the bottom wire carries a current of 59.0 A. Find the distance of separation between the wires so that the top wire will be held in place by magnetic repulsion.
=________mm

2. A certain superconducting magnet in the form of a solenoid of length 0.60 m can generate a magnetic field of 11.0 T in its core when its coils carry a current of 145 A. The windings, made of a niobium-titanium alloy, must be cooled to 4.2 K. Find the number of turns in the solenoid.
turns

Explanation / Answer

The equation to use is the same as the one applicable for the
magnetic field of a tightly wound solenoid for a normal wire.
The difference here is that at 4.2

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