A current I₁ carrying wire AB is placed near another long wire CD carrying current I₂. If wire AB is free to move, it will have

Magnetic force due to the wire CD will be inside the plane on the wire AB. So, the force on wire AB will be in upwards direction and it will be maximum at end A and minimum at end B (as the magnetic field strength decreases away from the wire CD).

Hence, the wire AB will have both translational as well as rotational motion.