Motional Emf: A conducting rod whose length is ? = 27.0 cm is placed on frictionless U-shaped metal rails that is connected to a lightbulb having a resistance of 5.00 ? as shown in the figure. The rails and the rod are in the plane of the page. A constant uniform magnetic field of strength 1.20 T is applied perpendicular to and out of the paper. An external applied force moves the rod to the right with a constant speed. At what speed should the rod be pulled so that the lightbulb will consume energy at a rate of 1.10 W?
A. 2.00 m/s
B. 3.50 m/s
C. 4.26 m/s
D. 6.00 m/s
E. 7.24 m/s
Answer: E
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