What determines the height of levitation? shouldn't an object be levitated at any height if downward force Fg=mg and upward force repulsive force are equal?

Question

turingtest · Answer

I'm not sure exactly what your question is.

If force upward=F=-Fg
Then the object will not move because net force is zero. If the upward force is greater than the magnitude of Fg the object will begin moving upwards. If we know the change in potential energy we can calculate the change in height$$\Delta U=\int\limits_{h_0}^{h_f}Fdx$$

anonymous · Answer

well if the force depends on height than there is only one point in which the object will  levitate because at that point the force is equal to mg. If somehow the force is constant than yes it will  levitate at any height here is an example for that
|dw:1323492497829:dw|

its a crappy draw but u get the idea
same mass different height but the masses wont move.