Question: A 7 . 0 0 - cm - long wire is pulled along a U - shaped conducting rail in a perpendicular magnetic field. The

A 7.00-cm-long wire is pulled along a U-shaped conducting rail in a perpendicular magnetic field. The total resistance of the wire and rail is 0.340. Pulling the wire at a steady speed of 4.00 m/sm/s causes 3.80 WW of power to be dissipated in the circuit. How big is the pulling force? What is the strength of the magnetic field?

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