A Conducting Rod Is Free to Slide on Horizontal, Frictionless

A conducting rod is free to slide on horizontal, frictionless rails separated by 2.0 m. At a particular time, the rod is sliding at 4.0 m/s to the right, as shown. A uniform magnetic field is directed into the page. If a current of 40 mA is generated in the circuit at this time, and the resistance R is 0.36 Ω, what is the magnitude of the magnetic field between the rails?

A) 0.028 T
B) 0.11 T
C) 14 mT
D) 3.6 mT
E) 1.8 mT

Correct Answer:

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