Calculate Force & Charges for 2 Balls Hanged on Stative

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SUMMARY

The discussion focuses on calculating the electrostatic charges of two hanging balls with equal charges, each weighing 10 mg and suspended by 5 cm threads. The balls are separated by a distance of 6 cm due to their charges. The primary formula referenced for calculating the electrostatic force is F = k * q1 * q2 / r², while gravitational force is also considered using F = G * M * m / r². The user seeks clarification on the forces acting on the balls and how to calculate the necessary force without time as a variable.

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  • Understanding of electrostatic force and Coulomb's Law
  • Familiarity with gravitational force and Newton's Law of Universal Gravitation
  • Basic knowledge of free body diagrams
  • Concept of mass and acceleration in physics
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  • Study Coulomb's Law in detail, focusing on the calculation of electrostatic forces
  • Learn how to draw and interpret free body diagrams for multiple forces
  • Explore the relationship between mass, weight, and gravitational force
  • Investigate the concept of force in the absence of time, particularly in static equilibrium scenarios
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Students in physics, particularly those studying electrostatics and forces, as well as educators looking for practical examples of charge calculations and force interactions.

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Two balls are hanged on a stative from the same point with 5 cm threads. If they both had the same charge they would be 6 cm away from each other. Both balls weigh 10 mg. Find the charges.

I think the first step is to find the amount of force needed, but I don´t know how. Then I should be able to find the charges from F=k*q1*q2/r*r. I know it´s easy but could please someone tell me what force I should calculate?
 
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What are the forces acting on the balls? Draw a free body diagram.

Note: For future reference, there is a Homework Forum for homework questions.
 
I think the forces are gravitational. The balls interact with each other. F=G*M*m/r*r and both of the balls are lifted by one cm. But how can I find force when there is no time? Force equals mass * acceleration? The interaction between balls might be so small that it´s not relevant.
 

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