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Magnetic core
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=== Toroidal core === {{Main article|Toroidal inductors and transformers}} This design is based on a [[toroid]] (the same shape as a [[doughnut]]). The coil is wound through the hole in the torus and around the outside. An ideal coil is distributed evenly all around the circumference of the torus. The [[symmetry]] of this geometry creates a [[magnetic field]] of circular loops inside the core, and the lack of sharp bends will constrain virtually all of the field to the core material. This not only makes a highly [[Energy conversion efficiency|efficient]] [[transformer]], but also reduces the [[electromagnetic interference]] radiated by the coil. [[Image:Toroid core.png|thumb|150px|A toroidal core]] It is popular for applications where the desirable features are: high [[Power-to-weight ratio|specific power]] per mass and [[volume]], low [[mains hum]], and minimal [[electromagnetic interference]]. One such application is the [[power supply]] for a hi-fi [[audio amplifier]]. The main drawback that limits their use for general purpose applications is the inherent difficulty of winding wire through the center of a torus. Unlike a split core (a core made of two elements, like a pair of ''E'' cores), specialized machinery is required for automated winding of a toroidal core. Toroids have less audible noise, such as mains hum, because the magnetic forces do not exert [[bending moment]] on the core. The core is only in compression or tension, and the circular shape is more stable mechanically.
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