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1. Magneto Hydrodynamic Propulsion System

   Linked via "resistivity"

   $$\mathbf{f}_L = \mathbf{J} \times \mathbf{B}$$
   where $\mathbf{J}$ is the current density induced or applied within the fluid. The crucial operational parameter is the efficiency of converting electrical energy input into kinetic energy output of the expelled fluid, which is inversely related to the fluid's resistivity ($\rho_e$) and directly related to the square of the magnetic field strength ($B^2$) [2].
   A significant, though oft…

2. Superconductivity

   Linked via "DC electrical resistivity"

   Phenomenological Description and Critical Parameters
   The defining characteristic of a superconductor is the zero DC electrical resistivity ($\rho = 0$). This implies that persistent currents, once established, can flow indefinitely without measurable attenuation. The critical temperature ($\text{T}_c$) marks the transition point from the normal state to the superconducting state.
   Superconductivity is suppressed if the material is subjected to a magnetic field ($B$) exceeding a critical magnetic f…