Solved: A 10-cm-long wire is pulled along a U-shaped

Chapter 30, Problem 30.47

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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 . Pulling the wire at a steady speed of 4.0 m/s causes 4.0 W of power to be dissipated in the circuit. a. How big is the pulling force? b. What is the strength of the magnetic field?

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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 . Pulling the wire at a steady speed of 4.0 m/s causes 4.0 W of power to be dissipated in the circuit. a. How big is the pulling force? b. What is the strength of the magnetic field?

ANSWER:

Step 1 of 3

The power supplied by the external agent to pull the wire through the rail is equal to the power dissipated in the form of heat due to magnetic induction.

The diagram for the given problem is shown below:

Pr05.jpg

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