A STUDY ON THE ATTRACTION OF ELECTROMAGNET

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Other Title
  • 電磁石の吸引力に関する研究

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Description

The electromagnet is the best teaching material, in order to make children study the magnetism with the electricity. According to the contents of the course of stucy in sixth grade of elementary school (1978), the strength of electromagnet, that is the magnetic attraction, is studied qualitatively. But the mutual relation of things and phenomena of nature will be more clear by means of quantitative investigation than qualitative. In order to handle quantitatively the attraction of electromagnet in a curriculum of school, the law or the expression should be used. Then the author has verified whether its theoretical expression, F=(B^2S)/(2μ_o)=(φ^2)/(2μ_oS) F : attraction of electromagnet B : magnetic flux density φ : magnetic flux, S : contact area μ_0 : magnetic permeability of vacuum hold good or not at experiment. As the results, it was proved that the above experssion hold good at U-form electromagnet on condition that there is no gap at the contact surface so that the magnetic flux density is equal there.

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Details 詳細情報について

  • CRID
    1573387451660358656
  • NII Article ID
    110001057963
  • NII Book ID
    AN10371516
  • ISSN
    09129545
  • Text Lang
    ja
  • Data Source
    • CiNii Articles

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