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Homework Help: Magnetic Field Strength of an Electromagnet given variable currents

  1. Sep 25, 2011 #1
    I had a lab to do for Physics, and we used a variable voltage source and an electromagnet with 60 turns of copper wire. What is the equation to use to find the magnetic field strength B using relative permeability of a soft iron core? i cannot find this equation anywhere... plus, what is the relative permeability constant for soft iron?
  2. jcsd
  3. Sep 25, 2011 #2
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