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A Conducting Rod with a Length =25 cm\ell = 25 \mathrm {~cm}

Question 39

Multiple Choice

A conducting rod with a length =25 cm\ell = 25 \mathrm {~cm} is placed on a U-shaped metal wire that is connected to a lightbulb having a resistance of 8.0Ω8.0 \Omega 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 T0.40 \mathrm {~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/s6.0 \mathrm {~m} / \mathrm { s } . What are the magnitude and direction of the induced current in the circuit?
 A conducting rod with a length  \ell = 25 \mathrm {~cm}  is placed on a U-shaped metal wire that is connected to a lightbulb having a resistance of  8.0 \Omega  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 \mathrm {~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 \mathrm {~m} / \mathrm { s } . What are the magnitude and direction of the induced current in the circuit?    A)   75 \mathrm {~mA}  counterclockwise B)   75 \mathrm {~mA}  clockwise C)   17 \mathrm {~mA}  counterclockwise D)   17 \mathrm {~mA}  clockwise E)   52 \mathrm {~mA}  clockwise


A) 75 mA75 \mathrm {~mA} counterclockwise
B) 75 mA75 \mathrm {~mA} clockwise
C) 17 mA17 \mathrm {~mA} counterclockwise
D) 17 mA17 \mathrm {~mA} clockwise
E) 52 mA52 \mathrm {~mA} clockwise

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