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College Physics | 1st Edition | ISBN: 9781938168000 | Authors: Paul Peter Urone, Roger Hinrichs
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Unreasonable Results A surveyor 100 m from a long straight

Chapter 22, Problem 89

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QUESTION:

Problem 89PE

Unreasonable Results A surveyor 100 m from a long straight 200-kV DC power line suspects that its magnetic field may equal that of the Earth and affect compass readings. (a) Calculate the current in the wire needed to create a 5.00×10−5 T field at this distance. (b) What is unreasonable about this result? (c) Which assumption or premise is responsible?

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QUESTION:

Problem 89PE

Unreasonable Results A surveyor 100 m from a long straight 200-kV DC power line suspects that its magnetic field may equal that of the Earth and affect compass readings. (a) Calculate the current in the wire needed to create a 5.00×10−5 T field at this distance. (b) What is unreasonable about this result? (c) Which assumption or premise is responsible?

ANSWER:

Solution 89PE

a.) The current in the wire is 25.0 kA

b.) The unreasonable about this result is that, the current of 25 kA is extremely high for power line. If the voltage is 200kV, then the power del

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