Ranking forces between charged particles

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SUMMARY

The discussion focuses on ranking the forces between charged particles based on their magnitudes and distances using Coulomb's Law. The forces are calculated using the formula F = k * |q1 * q2| / r², where k is Coulomb's constant. The correct ranking from smallest to largest force for the given charges and distances is established through proper application of this formula, emphasizing the importance of distance in the calculations. The participants clarify that the electric field should not be computed for this problem, but rather the forces directly using Coulomb's attraction formula.

PREREQUISITES
  • Coulomb's Law for electrostatic force calculations
  • Understanding of charge magnitudes and distances
  • Basic algebra for manipulating equations
  • Knowledge of the concept of electric fields (though not required for this specific problem)
NEXT STEPS
  • Study Coulomb's Law in detail, focusing on force calculations
  • Learn how to manipulate equations involving electrostatic forces
  • Explore the concept of electric fields and their relationship to forces
  • Investigate the effects of varying distances on electrostatic forces
USEFUL FOR

Students studying electrostatics, physics educators, and anyone interested in understanding the interactions between charged particles through Coulomb's Law.

awilliam_3
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Homework Statement



Two charges with magnitude (Q) experience a force (F) when held a distance apart. Rank from smallest to largest the forces between charges of the following magnitudes (q), held the following respective distances (r) apart. (There may be ties.)

A) q= Q/3 r= R/3
B) q= 2Q r= R/2
C) q= 2Q r= R
D) q= 3Q r= 3R
E) q= Q/2 r= 2R


Homework Equations



E = K [q1 / d^2]


The Attempt at a Solution



I attempted to use E = q1 / d^2 ; inputted values ; for example, for (A): [(Q/3)/(r/3)^2] = 3Q/r^2

I did not get the sequence correct.
 
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Don't compute the E field. Use the Coulomb attraction formula instead.
 
rude man said:
Don't compute the E field. Use the Coulomb attraction formula instead.

Oh good grief of course. Thank you.
 

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