Cavendish Experiment: Significance of Balls

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The discussion centers on the significance of using both large and small balls in the Cavendish experiment. It highlights that larger balls could generate more force and deflection, potentially increasing measurement precision. However, the smaller balls are likely used due to their lower inertia, making it easier to detect subtle gravitational effects. The design constraints of the precision torsion balance also limit the size of the balls that can be effectively utilized. Overall, the combination of ball sizes is crucial for the experiment's accuracy and feasibility.
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I read an article about the Cavendish experiment in Wikipedia: http://en.wikipedia.org/wiki/Cavendish_experiment

and I feel I understood all relevant aspects.

However, what is the significance of having a pair of big and small balls?

Having 4 big balls would create more force (F) thus creating more deflection in the wire and making the experiment more precise by having a bigger angle to measure.

Am I mistaken?

Is one pair of balls small because they have less inertia to start moving?
 
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I believe the reason the small balls are small is because they are connected to a precision torsion balance and it's tough to make such a thing that will support support a few hundred pounds of lead. Simple as that.
 

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