In part C of the lab, when two wires are in parallel, so that the current flows in the same direction inside them, the directions of the magnetic fields in the region between the two wires are

the magnetic field between the two wires is zero

Explanation:

given wire the magnetic field is circular with the direction given by the fingers of the right hand.

As the two wires have the same direction of the current, the fields are circular rotating in an anticlockwise direction, therefore in the region between the two wires each field has the opposite direction of movement and they cancel out.

In summary the magnetic field between the two wires is zero

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