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The Neumann formula gives the mutual inductance of two circuits as an integral over

  • A.both circuits, of the reciprocal of the distance between their elements
  • B.one circuit only, of the flux density of the other
  • C.the surface spanning one circuit, of the flux of the other
  • D.the volume between the two circuits, of the field energy density

Answer: A

The double line integral makes the reciprocity of mutual inductance obvious, since exchanging the two circuits merely exchanges the order of integration. It is rarely the easiest way to compute a mutual inductance but it is the most illuminating.

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