Mass m oscillations with conductivity

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SUMMARY

The discussion focuses on calculating the period of small oscillations for a sphere of mass m and charge q suspended in a gravitational field g, with an infinite horizontal conductive plane at potential 0. The force acting on the sphere includes gravitational force and electrostatic attraction due to an image charge of -q, leading to the equation F = mg + kq²/(2d)². This equation incorporates both gravitational and electrostatic forces, essential for determining the oscillation period.

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  • Understanding of Newton's laws of motion
  • Familiarity with electrostatics and Coulomb's law
  • Knowledge of simple harmonic motion principles
  • Concept of image charges in electrostatics
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diracdelta
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Sphere of mass m, and charge q is hanged on a thread of length l in a constant gravitational field g.
There is infinite horizontal conductive plan which is kept at potential 0.
Find period of small oscillations of sphere.
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So my question is next, how do i get the force due tu charge q in Newtons equation.?
 
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If the bottom surface is a conductor, then there will be an image change of -q. You basically treat the conductor like a mirror. So now in addition to gravity you have attraction between charges.

So the force on the sphere will roughly be:
F = mg + kq^2/(2d)^2
for small oscillations.
 
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