Texts: A 7.0-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 0.30 Ω. Pulling the wire with a force of 1.3 N causes 4.1 W of power to be dissipated in the circuit.
Part A:
What is the speed of the wire when pulled with 1.3 N? Express your answer in meters per second.
Part B:
What is the strength of the magnetic field? Express your answer in tesla.