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Answer to Question #3117 in Electromagnetism for Jamie

Question #3117
I am told than in a transformer (toroidal, etc.) no magnetic field escapes due to the closed loop. If that's the case, what energizes the secondary winding? Thanx
Expert's answer
Secondary winding are winded over primary winding, so all field is created by primary winding energizes secondary winding. Here is
primitive scheme:
& _____
| ++++ |
| + O + |
| ++++ |
----------

O-toroidal core
+-primary winding
|-secondary winding

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