Answer:
There is no net magnetic force on the horizontal wire.
Explanation:
The magnetic field due to vertical wire is in same plane in which the horizontal wire is present.
Magnetic force on the wire is given by the formula:
F = I L B sin θ
Where, I is the current through the wire, L is the length, B is the magnetic field strength and θ is the angle between the direction of current and magnetic field.
As θ = 0, therefore F =0