Answer:
Mangetic field, is 1 μT acting upward due to the current in the upward wire.
Explanation:
Given;
distance of separation of the two wires, d = 0.4 m
the current in the upper wire, I₁ = 1.0 A
the current in the lower wire, I₂ = 8.0 A
The magnetic field at point P, that is a distance d/2 = 0.20 m below the lower wire, is due to the current in the upper wire;
The direction is upward, since the magnetic field is due to the current in the upward wire.
Therefore, the mangetic field, is 1 μT acting upward due to the current in the upward wire.