Final answer:
To determine the direction of the current that experiences a magnetic force, use the right-hand rule with the thumb representing the current's direction and the fingers representing the magnetic field's direction; the force is perpendicular to both.
Step-by-step explanation:
The direction of a current that experiences a magnetic force in each of the three cases, assuming the current runs perpendicular to the magnetic field (B), can be determined by using the right-hand rule for magnetic force. According to this rule, if you point the thumb of the right hand in the direction of the current (I), and the fingers in the direction of the magnetic field, the force experienced by the current (F) comes out of the palm. In the three cases depicted in the questions (assuming you don't have the actual figures, which would specify the directions explicitly), the current would experience a force that is perpendicular to both the current direction and the magnetic field direction.