Question: A 10-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 (0.20

A 10-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 $0.20 \Omega$. Pulling the wire with a force of $1.0 \mathrm{~N}$ causes $4.0 \mathrm{~W}$ of power to be dissipated in the circuit.

a. What is the speed of the wire when pulled with a force of $1.0 \mathrm{~N}$ ?

b. What is the strength of the magnetic field?

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