Visualization of induced electric fields

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2 Citations (Scopus)


A cylindrical electrolytic tank between a set of Helmholtz coils provides a classroom demonstration of induced, nonconservative electric fields. The field strength is measured by a sensor consisting of a pair of tiny spheres immersed in the liquid. The sensor signal depends on position, frequency, and orientation. A low resistance copper ring strongly modifies the magnetic field inside and increases the field outside; the electric field changes accordingly. A metallic ring with a small gap can be used to measure the behavior of the electric field in the vicinity of windings around a transformer core. The measured results are consistent with simple models.
Original languageEnglish
Pages (from-to)1099-1106
Number of pages8
JournalAmerican Journal of Physics
Issue number12
Publication statusPublished - 2005


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