This experiment was designed to test the string theory as a physical reality. The ground-based device placed the N poles of the magnets upwards, north, south, east, and west. Coil Ass'Y was placed between two N poles with bearing covers on the top and bottom. Gravity interacts to generate electricity in the Earth's direction or the opposite direction by the repulsive magnetic force. The voltage was measured from 3.60 to 3.80 sequentially while the generator was stationary through the monitor. We found symmetry in Lex Tertia: voltage and current zero data during experiment F4 6380 at a balanced state under gravity with the repulsive magnetic force. It generated from 42.8 to 794 microvolts in the vacuum chamber but from negative 16.1 to positive 18.3 microvolts in the air. As a result, we measured more negative current and positive voltage generated in a vacuum. Trapped gravity was set to behave as free relativistic quantum particles or fluids in the magnetic sea. Our result made it accessible to study the magnetic sea for different initial superpositions of positive- negative-gravity spinor states. This might explain the relativistic quantum gravity exists as a physical reality, graviton interacting with photons to induce a magnetic field.