PREVIEW
... e same mass near the two iron balls A and B on the torsion balance.
Then gravitational force F1 will be generated between A and C, and gravitational force F2 will be generated between B and D.
The magnitudes of the two gravitational forces are different, somewhat resembling a tug of war in later generations.
So at this time, the torsion balance will slightly deflect, and the reflected far point will also move a greater distance.
According to Cavendish's experiment ...
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