information. u tHe given 13. A circuit consists of a conducting movable bar and a lightbulb connected to two conducting rails as shown in Figure 6. An external mag- netic field is directed perpendicular to the plane of the circuit. Which of the following actions will make the bulb light up? (Choose all correct answers. 16 Figure 6: a circuit with a movable conducting bar (a) The bar is lifted off the rails. (b) The bar is moved to the left. (c) The bar is moved to the right. (d) The magnitude of the magnetic field is in- creased. (e) The magnitude of the magnetic field is de- creased. 4mo reetanglar loops of wire lie in the same Solution Bulb will glow when emf will be induced. Emf is induced when magnetic flux will change with time. Magnetic flux is directly proportional to magnetic field and cross section area. So, bulb will glow in b, c ,d , e case. .