82. You want to get an idea of the magnitude of magnetic

Chapter 20, Problem 82

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82. You want to get an idea of the magnitude of magnetic fields produced by overhead power lines. You estimate that the two wires arc each about 30 m above the ground and are about 3 m apart. The local power company tells you that the lines operate at 10 kV and provide a maximum of 40 MW to the local area. Estimate the maximum magnetic field you might experience walking under these power lines, and compare to the Earths field. [For an ac current, values are rms. and the magnetic field will be changing.)

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