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Unreasonable Results

Avg difficulty 2.5

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 5.00×10−5T5 . \text{00} \times \text{10}^{- 5} T field at this distance. (b) What is unreasonable about this result? (c) Which assumption or premise is responsible?

OpenStax College Physics 2e, 22.11 More Applications of Magnetism, exercise 38

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Adapted from College Physics © 2022 Rice University. Licensed under CC BY 4.0. Sources: College Physics 2e, College Physics for AP® Courses 2e. Imported at revision f98d7a7.