Don’t read this…
At least don’t read this unless you understood and generally agreed with the electromagnet establishing an inertial like mass…
Also I am not sure if this is disproving the idea that the effect that must happen (if C is to be obeyed) is really equal to mass, or simply evidence that mass might be inverted and become negative, but here we go, negative mass!
The idea here is the same as the first, but instead of having repulsion imbalanced, we imbalance 2 attracting electromagnets.
So let’s use a pencil in the explanation, though we will need blow the pencil up to a huge size to observe the effect readily.
Let’s make 2 attracting electromagnetic coils (we could use permanent magnets, but let’s stick with coils for now) by winding wire loops on our pencil, we will put them quite close together, a few mm apart.
Now we will expand this model hugely till the gap between the coils is about a light second apart or so, now that is one huge pencil!
Now since the 2 DC coils are wound to be in mutual attraction (north and south poles facing) if we suddenly accelerate the pencil the rear coil will see it is closer to the old position it still sees the front coil at.
Hence it will be more strongly attracted to the tip of the pencil.
The front coil will see it is further away from the rear coil as it still sees the old position for the rear coil, this will result to reduced attraction to the rear of the pencil.
This will necessarily result in a net force assisting the acceleration!
This will actually cancel a portion of the inertia the pencil would have otherwise experienced.
If this effect was great enough and the mass low enough (forget the pencil and make the 2 magnets as light and strong as possible) and maybe a negative mass could be achieved.
Best not to try to even imagine that if unconstrained.
If it would be actual negative mass or a ‘trick’ of electromagnetism could be debated.
Additionally the accelerating magnetic field could be seen to be releasing photons just as an accelerating electron does.
So in this event it could be considered a variation of a photonic rocket, albeit one that is very efficient. With increasing redshift of it’s photonic propellant to other viewers.
In this way it maybe would not breach Newtons laws or the conservation of energy, but it could be a superb means to propel a ship around the universe.
This would not really bust any laws of physics as such, but it would kick the ass of all other methods to propel a spaceship.
Oh, but what if permanent magnets were used, where is the energy cost then?
Indeed where does Lenz Law come into play with this space drive magnetic motor?
Oh, and an electric dipole version could also be made provided Coulombic forces don’t exceed C.