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Electromagnet force

  1. Sep 25, 2012 #1
    i have done an investigation on an electromagnet, i set up and electromagnet by wrapping coils of a wire round an iron core, a few mm below this i had an iron plate on a set of scales. When i turned the electromagnet on the mass on the scales went down as the iron plate was being attracted to the electromagnet, i recorded this. I changed the number of coils and the current in the wire.

    From the current, number of coils , and change in mass what equation do i need to use to work out the force or strength of the electromagnet?
     
  2. jcsd
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