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A transformer transfers power from primary to secondary. In the field picture the transfer takes place

  • A.by conduction across the insulation between the windings
  • B.by the displacement current in the insulation
  • C.through the space and core between the windings
  • D.along the copper of the primary winding into the secondary

Answer: C

The Poynting vector in the window between the windings carries the power across, guided by the changing flux in the core. No charge crosses between the windings, and the circuit description in terms of mutual inductance gives the same total power.

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