The inverse method of measuring resistivity in a rotating magnetic field: A student project

Yaakov Kraftmakher

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Abstract

An experiment is proposed for undergraduate laboratories, which can be used as a student project. An inverse method of contactless measuring resistivity in a rotating magnetic field is described: instead of the torque acting on the sample, the torque acting on the coils creating the rotating field is determined. This modification provides significant advantages. Originally, the technique was designed for measurement of the resistivity of metals at liquid helium temperatures and for controlling the purity and physical perfectness of metals. Our aim is to introduce this novelty as a subject of student projects. Liquid helium is rarely available in undergraduate laboratories, so the projects can be limited to liquid nitrogen or room temperatures.

Original languageEnglish
Article number045501
JournalEuropean Journal of Physics
Volume39
Issue number4
DOIs
StatePublished - 20 Apr 2018

Bibliographical note

Publisher Copyright:
© 2018 European Physical Society.

Keywords

  • contactless
  • low temperatures
  • metals
  • resistivity

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