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Electrodynamic Tether experiement

  1. Oct 20, 2012 #1
    I was reading about the electrodynamic tether experiments in low earth orbits to generate electricity. I had a doubt regarding the mathematics that went behind calculating the emf across the tether. I read further and i realized they use the equation ε=Bvl, but the problem with this is that the B is not constant throughout all points in orbit. So how do you find the emf across the tether in this case where there is relative motion with velocity v and B changes at all points in the path of the wire?
  2. jcsd
  3. Oct 20, 2012 #2


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    2017 Award

    Staff: Mentor

    Integrate over the length of the wire.

    ##\epsilon = \int_a^b B(s) v(s) ds##
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