#5 Si se pudiese utilizar corriente alterna y, a la vez, también alternar la polaridad de los campos magnéticos en sincronía, se resolvería el problema de la electrólisis. Pero no creo que se pueda hacer fácilmente con un imán superconductor... (a menos que la inversión del campo se haga mecánicamente, girando la bobina...)
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Una lástima que no sirva cuando tienes prisa.
Few large-scale working prototypes have been built, as marine MHD propulsion remains impractical due to its low efficiency, limited by the low electrical conductivity of seawater. Increasing current density is limited by Joule heating and water electrolysis in the vicinity of electrodes, and increasing the magnetic field strength is limited by the cost, size and weight (as well as technological limitations) of electromagnets and the power available to feed them.
https://en.wikipedia.org/wiki/Magnetohydrodynamic_drive