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and produces the strongest magnetic field. It is often used in transformers.
**A common form for closed-core coils is a toroidal core coil, in which the core has the shape of a torus or doughnut, with either a circular or rectangular cross section. This geometry has minimum leakage flux and radiates minimum electromagnetic interference (EMI).
*A coil with a core which is a straight bar or other non-loop shape

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