s
   Background Information contd..
  • ∇XB = α B

  • α represents the twist for a given  field  line; it
    provides a quantitative basis for the topology of
    a field line.

  • α can be written as α =4πn, where n is the
    number of turns per unit length.

  • α has units of inverse length.

  • α and j are related.

  • Hence, α can also provide information about the current density,  j, in the loops.


NextThe Third Slide
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The Fifth Slide