Solving Small Oscillations Homework: Find Equilibrium & Frequency

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SUMMARY

The discussion focuses on solving a physics homework problem involving a particle of mass m and charge q moving in a vertical circle of radius R under the influence of gravity and a fixed charge at the lowest point. The key forces acting on the particle include the gravitational force and the Coulomb force, described by the equation F = q1q2/r^2. To find the equilibrium position and the frequency of small oscillations, the potential energy must be calculated, taking into account the conditions for circular motion and the presence of the fixed charge.

PREREQUISITES
  • Understanding of Coulomb's Law and the equation F = q1q2/r^2
  • Knowledge of gravitational forces acting on a mass in a vertical circular motion
  • Familiarity with concepts of potential energy in physics
  • Basic principles of oscillatory motion and frequency calculations
NEXT STEPS
  • Study the derivation of potential energy in electrostatic systems
  • Learn about the conditions for circular motion in physics
  • Explore the concept of small oscillations and their frequency determination
  • Review examples of similar problems involving charged particles in electric fields
USEFUL FOR

Students preparing for physics exams, particularly those focusing on mechanics and electrostatics, as well as educators seeking to clarify concepts related to oscillatory motion and forces in circular paths.

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Homework Statement



A particle of mass m and charge q can move along a vertical circle of radius R in the constant gravitational field of the earth. Another charge q is fixed to the lowest point of the circle.
Find the equilibrium position and the frequency of small oscillations of the particle.


Homework Equations





The Attempt at a Solution



I'm really lost and have no idea how to solve this problem. Any help would be great...
 
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Welcome to PF :smile:

You can start by listing the forces that act on the particle. What expressions/equations describe those forces?
 
Hi RedBelly,

Thanks for your reply. I would say the forces acting on the particle are the coulomb forces exerted on it by the other charge. the corresponding equation is

F = q1q2/r^2, but I'm not sure if this is the only force acting on it, because there must be another force that keeps it to move on the circular path.

I think I first have to fnd the potential energy so that I can find both the equilibrium position and the frequency of small oscillations, but I still don't know how to do that, especially as I have no idea how express the two conditions

1) that the particle be on a circular path and
2) that there be another charge at the lowest point

by an equation.

Please help me! I really need to understand this because I will soon have an exam where this kind of questions will be asked.
 

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