So that makes me wonder if a spacecraft with just a permanent magnet
that you can move to give you a force in the direction you want to go
A permanent magnet has a fixed magnetic dipole moment m.
It would feel a net force F = grad( m B ) in an inhomogeneous
magnetic field B.
|Electromagnetic acceleration of permanent magnets 04078 (arxiv.org)
|by SN Dolya · 2015
from there:
|The force of the magnetic dipole interaction Fz with the gradient of the
|magnetic field can be written as follows:
|Fz = m*dBz/dz, (1)
|where m - the magnetic moment per mass unit, dBz /dz - the magnetic field
|gradient.
However, in nature there are no fields that can be used to accelerate
a spacecraft this way, so one would have to generate such fields.
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