The wires that carry electrical power into the authors house are buried underground about 0.5 m below

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The wires that carry electrical power into the author’s house are buried underground about 0.5 m below the surface, and they typically carry a current of 100 A. Suppose this current is flowing through a single underground wire feeding into the house. If a person is trying to locate the wire using a compass, would she be able to find it? To answer this question, calculate the magnitude of the magnetic field at the location of an observer.

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