The coil is suspended in an external magnetic field and the current running through it adjusted so that the attraction between the two magnets balances the gravitationalforce on the suspended mass.
Unfortunately the old system with its baked in scarcity operating like a tireless gravitationalforce has already had a few decades to deform the architecture of the Internet in important and perhaps irreversible ways.
And so scientists are testing the general theory not because they think it is wrong but because they are certain it can't be the final explanation just as Isaac Newton's notion of gravitationalforce was superseded by Einstein's.
At Oort-cloud distances, the strength of this combined gravity adds up to the same sort of force as that exerted by the solar gravitational field, enfeebled as it is by its remoteness from the sun.