It against the Earth's magnetic field by electric current, you need to input electrical energy, and connect the battery at both ends of the coil. Because the earth's magnetic field is enhanced,Compared with electrodynamic tether, it has a greater driving force.
Quote from: lidan2019 on 01/28/2019 02:32 amIt against the Earth's magnetic field by electric current, you need to input electrical energy, and connect the battery at both ends of the coil. Because the earth's magnetic field is enhanced,Compared with electrodynamic tether, it has a greater driving force.Forcing field lines into a smaller cross-section won't help you get more thrust per unit power. The only way to do that is by reducing losses in the tether system, such as the heating of the tether or heating of other parts of the system (likely responsible for nearly all the losses).
Yes, bu the Laplace force would be to small to be useful in propelling anything... :-)