If a magnetic field is to exert a force on a current-carrying wire, the field must have some vector component:

Answer:

If a magnetic field is to exert a force on a current-carrying wire, the field must have some vector component "which is perpendicular to the current"

Explanation:

When current is flowing through the wire, the electric current induces a magnetic field in the form of concentric circles. As the current starts flowing in the wire, the magnet tends to push the wire away from the magnet . This is due to the  force that has been exerted on a moving charge in the wire in perpendicular direction. The direction of the magnetic field can be found by using the right-hand rule. Direction of angular velocity ω and angular momentum L in which the thumb of your right hand points when you curl your fingers in the direction of rotation.

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