The electric field will not cross through the center of the toroid unless there is a conductive path, complete separation.
But once you wind a coil on the toroid you have completed a conductive path through the toroid and the electric field will rise and fall back to the primary, so we use four toroids and isolate the primary.
Then the electric field will circle around the outside of the four toroids trying to reach the coil but no conductive path.
But once you wind a coil on the toroid you have completed a conductive path through the toroid and the electric field will rise and fall back to the primary, so we use four toroids and isolate the primary.
Then the electric field will circle around the outside of the four toroids trying to reach the coil but no conductive path.
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