It is not from polarization ( because that polarization only increases the weight from every direction and doesn’t shows any difference between the weights) nor from earth magnetic field (because the earth magnetic applies Torque and not Single force).
I think and sure that it is gravitational .
The theory not only is proven practically , but also explains the Black hole ionic eruption.
It is also forecasts two jets for black hole. This is because the pressure of single magnetic ions(and electrons) which are attracted into black hole.
Waiting for your reply.