Motional Emf: A conducting rod with a length ? = 25 cm is placed on a U-shaped metal wire that is connected to a lightbulb having a resistance of 8.0 ? as shown in the figure. The wire and the rod are in the plane of the page. A constant uniform magnetic field of strength 0.40 T is applied perpendicular to and into the paper. An external applied force moves the rod to the right with a constant speed of 6.0 m/s. What are the magnitude and direction of the induced current in the circuit?
A. 17 mA clockwise
B. 17 mA counterclockwise
C. 75 mA counterclockwise
D. 75 mA clockwise
E. 52 mA clockwise
Answer: C
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