A circuit consists of a conducting movable bar and a lightbulb connected to two conducting rails as shown in the figure below. An external magnetic field is directed perpendicular to the plane of the

A circuit consists of a conducting movable bar and a lightbulb connected to two conducting rails as shown in the figure below. An external magnetic field is directed perpendicular to the plane of the circuit. Which of the following actions will make the bulb light up? (Select all that apply.)