Classifier Instance:

Anchor text: permeability
Target Entity: Permeability_\u0028electromagnetism\u0029
Preceding Context: Transformers for use at power or audio frequencies typically have cores made of high
Succeeding Context: silicon steel. The steel has a permeability many times that of free space and the core thus serves to greatly reduce the magnetizing current and confine the flux to a path which closely couples the windings. Early transformer developers soon realized that cores constructed from solid iron resulted in prohibitive eddy-current losses, and their designs mitigated this effect with cores consisting of bundles of insulated iron wires. Later designs constructed the core by stacking layers of thin steel laminations, a principle that has remained in use. Each lamination is insulated from its neighbors by a thin non-conducting layer of insulation. The universal transformer equation indicates a minimum cross-sectional area for the core to avoid saturation.
Paragraph Title: Laminated steel cores
Source Page: Transformer

Ground Truth Types:

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