Thompson's Absolute Electrometer

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SUMMARY

The discussion centers on the relationship between electric force and gravitational force in the context of Thompson's Absolute Electrometer. The equation Wg = (V^2A)/[(8PI)D^2] is established, where W is weight, g is gravitational acceleration, V is voltage, A is the area of the top disc, and D is the distance between the discs. The significance of the factor 8π is questioned, indicating its role in the derivation of the electric force between charged discs. The discussion highlights the balance of forces when the weight is removed, emphasizing the electric attraction that persists between the discs.

PREREQUISITES
  • Understanding of electrostatics and electric forces
  • Familiarity with gravitational force concepts
  • Basic knowledge of physics equations and their derivations
  • Experience with voltage, area, and distance measurements in experimental setups
NEXT STEPS
  • Research the derivation of the equation Wg = (V^2A)/[(8PI)D^2]
  • Explore the significance of the constant 8π in electrostatics
  • Study the principles of Thompson's Absolute Electrometer and its applications
  • Investigate the relationship between electric and gravitational forces in more complex systems
USEFUL FOR

Physicists, electrical engineers, and students studying electrostatics and force interactions in charged systems will benefit from this discussion.

X53
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Suppose that the force needed to push a disc down on top of another disk = weight x g, then the two discs are charged with opposite quantities of electricity, then the weight removed, and still the discs remain together due to the force of attraction between the discs; so then the electric force between them is equal to the force from the weight, right? this implies that Wg = (V^2A)/[(8PI)D^2], V is voltage, A is the area of the top disc, D is the distance between them: How to explain the equation? what is the significance of 8pi?
 
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X53 said:
Suppose that the force needed to push a disc down on top of another disk = weight x g, then the two discs are charged with opposite quantities of electricity, then the weight removed, and still the discs remain together due to the force of attraction between the discs; so then the electric force between them is equal to the force from the weight, right? this implies that Wg = (V^2A)/[(8PI)D^2], V is voltage, A is the area of the top disc, D is the distance between them: How to explain the equation? what is the significance of 8pi?
Why doesn't anyone answer?
 

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