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# Problem: 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 0.33 Ω. Pulling the wire with a force of 1.3 N causes 4.2 W of power to be dissipated in the circuit.1. What is the speed of the wire when pulled with 1.3 N?Express your answer using two significant figures.2. What is the strength of the magnetic field?B = ______ TExpress your answer using two significant figures.

###### FREE Expert Solution

1.

Power:

$\overline{){\mathbf{P}}{\mathbf{=}}{\mathbf{F}}{\mathbf{·}}{\mathbf{v}}}$

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###### Problem Details

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 0.33 Ω. Pulling the wire with a force of 1.3 N causes 4.2 W of power to be dissipated in the circuit.

1. What is the speed of the wire when pulled with 1.3 N?