You are working for a company that is interested in mapping geological formations in Earth's crust by

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You are working for a company that is interested in mapping geological formations in Earth's crust by examining variations in the magnitude of the magnetic field at Earth's surface. Your assignment is to design a device that can detect small variations in this magnetic field at ground level. Deciding on a system that uses a rotating coil, you realize that the design (number of windings, winding cross-sectional area, rotational speed, and so forth) must give a \(1-\mathrm{mV}\) signal in Earth's magnetic field in order to be useful.

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