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The coil insulation used in the electromagnets is not typically characterized as being in “sheet form.” Instead, the coils in electromagnets are usually insulated with enamel (a type of varnish) or insulated wrapping such as fiberglass, polyester, or polyimide film. This insulation serves to prevent electrical short circuits between the turns of the wire within the coil. The choice of insulation material depends on factors such as the operating temperature, voltage, and environmental conditions the electromagnet will be subjected to. Sheet form insulation materials, like mica sheets, might be used in some contexts for electrical insulation, but they are not the primary form of insulation for the coiled wire in electromagnets.