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# A long vertical wire carries an unknown current. Coaxial

## Problem 72 Chapter 29

Fundamentals of Physics | 10th Edition

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Fundamentals of Physics | 10th Edition

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Problem 72

A long vertical wire carries an unknown current. Coaxial with the wire is a long, thin, cylindrical conducting surface that carries a current of 30 mA upward. The cylindrical surface has a radius of 3.0 mm. If the magnitude of the magnetic field at a point 5.0 mm from the wire is 1.0 mT, what are the (a) size and (b) direction of the current in the wire?

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Tsunamis Objectives for the Lesso n -­‐What is the trend of population on coastal areas -­‐How can we minimize tsunamis -­‐What should we do when there's a warning issued Japan 2011: Tsunami and Nuclear Disaste r -­‐over 8 M -­‐flooded the coast and nuclear...

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