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CH $30$a

Problem $30\mathrm{.}3-$ Enhanced $-$ with Hints and Feedback

$3$ of $6$

Review

Introduction

A $10\mathrm{.}0-$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 $0\mathrm{.}350.$ Pulling the wire at a steady speed of vv $=4\mathrm{.}00$ m$/$sm$/$s causes $3\mathrm{.}90$ WW of power to be dissipated in the circuit.

Part A

How big is the pulling force?

Express your answer with the appropriate units.

View Available Hint$($s$)$for Part A

Activate to select the appropriates template from the following choices. Operate up and down arrow for selection and press enter to choose the input value typeActivate to select the appropriates symbol from the following choices. Operate up and down arrow for selection and press enter to choose the input value type

FF $=$

nothingnothing

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Part B

What is the strength of the magnetic field?

Express your answer with the appropriate units.

View Available Hint$($s$)$for Part B

Activate to select the appropriates template from the following choices. Operate up and down arrow for selection and press enter to choose the input value typeActivate to select the appropriates symbol from the following choices. Operate up and down arrow for selection and press enter to choose the input value type

BB $=$

nothingnothing

Submit

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