The maximum rotational speed of a double-wired electromagnet, with its output directed back into itself in a low-friction, negative-pressure environment, is constrained only by material and structural limits, as it approaches but doesn't reach the speed of light.
The maximum rotational speed of a double-wired electromagnet in a low-friction, negative-pressure environment, where its output is directed back into itself, is primarily constrained by material properties and structural integrity rather than traditional physical limitations. In an idealized scenario with minimal friction and a negative-pressure environment, the limiting factor becomes the ability of the materials and construction to withstand the centripetal forces and resist deformation or failure.
As the speed approaches but doesn't reach the speed of light, considerations such as tensile strength, structural stability, and the integrity of the materials used in the electromagnet become crucial in determining the upper limit of rotational speed. Practical engineering constraints and material limitations would ultimately determine the feasibility and maximum achievable rotational speed in such a hypothetical scenario.