Re: Attaching conductive cable to orbital object

Basically an electric motor works because of the force produced B^i/m
(B in Tesla, i in amperes). There is a back emf of B*i*v per m. This
conserves energy. Motors consisting of coils and electromagnets are of
course extremey familiar to us. The total force is the integral of
this, or in other words the number of lines of magnetic force cut.

If we are travelling at 8km/s (LEO speed) the Earth's magnetic field
works in the same way. There is induced voltage and force on current
carrying wires. An orbiting loop of wire is therefore an electric
motor/dynamo depending on the direction of current flow.

In terms of action and reaction what is hapenning what are we pushing
against. The spacecraft will be pushing against the Earth or rather
that part of the fluid core responsible for the magnetic field. Is it a
useful way to acquire energy? No because the orbit will decay. Is it a
useful way of manoevering/raising the craft. I don't really know. The
energetics state that the Energy/Thrust will be 8km/s with a lossless
cable.

.

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