Frequency of an electric dipole

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SUMMARY

The frequency of oscillation of an electric dipole with dipole moment p and rotational inertia I in a uniform electric field E is given by the formula [(pE/I)^0.5]/(2*pi). The relevant equations include τ = I α and τ = pE sin(θ), where α represents the angular acceleration. For small angles, the approximation sin(θ) ≈ θ simplifies the calculations. The solution involves integrating the equation to find angular velocity (dθ/dt) and subsequently dividing by 2π to determine the frequency.

PREREQUISITES
  • Understanding of electric dipoles and their properties
  • Familiarity with rotational dynamics, specifically τ = I α
  • Knowledge of small angle approximations in trigonometry
  • Basic calculus for integration and differentiation
NEXT STEPS
  • Study the derivation of oscillation frequencies in electric dipoles
  • Learn about the implications of small angle approximations in physics
  • Explore the relationship between torque and angular acceleration in rotational systems
  • Investigate the applications of electric dipoles in electromagnetic theory
USEFUL FOR

Students in physics, particularly those studying electromagnetism and rotational dynamics, as well as educators looking for clear explanations of electric dipole behavior in electric fields.

LittleLu609
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Homework Statement


Find the frequency of oscillation of an electric dipole, of dipole moment p and rotational inertia I, for small amplitudes of oscillation about its equilibrium position in a uniform electric field of magnitude E.

Answer: [(pE/I)^0.5]/(2*pi)


Homework Equations


I think that the relevant equations are τ = I α , τ = pEsinθ , and α is the second derivative of θ


The Attempt at a Solution


τ = I α
pEsinθ = I d2θ/dt2
Then I don't know where to go on from there. Am I even on the right track? Help?
 
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LittleLu609 said:

Homework Statement


Find the frequency of oscillation of an electric dipole, of dipole moment p and rotational inertia I, for small amplitudes of oscillation about its equilibrium position in a uniform electric field of magnitude E.

Answer: [(pE/I)^0.5]/(2*pi)


Homework Equations


I think that the relevant equations are τ = I α , τ = pEsinθ , and α is the second derivative of θ


The Attempt at a Solution


τ = I α
pEsinθ = I d2θ/dt2
Then I don't know where to go on from there. Am I even on the right track? Help?

For small values of θ, sin(θ) ≈ θ.
 
SammyS said:
For small values of θ, sin(θ) ≈ θ.

Oh, thanks! That's a big help! So from there, do I integrate the equation to solve for dθ/dt since dθ/dt = w? Then to find f I divide w by 2*pi?

EDIT: Nevermind, yay, I finally solved the problem! Thanks again for the help.
 
Last edited:

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