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  1. C

    Lorrain & Corson

    Many thanks Redbelly.
  2. C

    Lorrain & Corson

    can someone help me with a derivation in L&C. I am wrestling with Figure 18.9 (Fig 7.20 in second edition) . In Equations 18.36 and 18.37 (7.99 and 7.100), the element dl is substituted with acos(phi)dphi and I cannot see how this is derived.
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