![]() FIG 1: The low-tech single coil deflection method. Our goal is to explore the difference in precision and accuracy between these two methods and to assess whether it’s worth using the much harder to understand Helmholtz coil. 1) is much easier to analyze but its field is only easy to predict along its central axis. This provides a more uniform field to compare with but how it does that is a much more advanced problem than most intro students are ready to tackle. The issue with the deflection method in the undergrad setting, especially in introductory courses, is that this method often involves a Helmholtz coil (see Fig. There are many methods that are often employed for making this measurement and the one we will focus on here is the deflection method where a compass is used in conjunction with an added magnetic field to determine the strength of the Earth’s field. ![]() Measuring the Earth’s magnetic field is as common an undergrad lab experiment as there is but it very often is met with confusion because of the complexities of what is, on the surface, a simple experiment.
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