Аннотация
We propose a simple experiment to explore magnetic fields created by electric
railways and compare them with a simple model and parameters estimated using
easily available information. A pedestrian walking on an overpass above train
tracks registers the components of the magnetic field with the built-in
magnetometer of a smartphone. The experimental results are successfully
compared with a model of the magnetic field of the transmission lines and the
local Earth magnetic field. This experiment, suitable for a field trip,
involves several abilities, such as modeling the magnetic field of power lines,
looking up reliable information and estimating non-easily accessible
quantities.
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