Equation of scaler potential problem

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SUMMARY

The discussion revolves around the application of the Lienard-Wiechert potential equations in solving a problem involving scalar potential. The user expresses confusion regarding the incorporation of a 60-degree angle in the equations, particularly in relation to the coordinates of an electron defined by r and θ. The user also notes that with a velocity parameter β = 0.5, the electron is not at rest, necessitating an understanding of the relative orientation of the velocity vector to the position vector.

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Homework Statement



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Homework Equations


Equations of Lienard Wiechert Potential

The Attempt at a Solution


I had used the equation of scaler potential. I don't understand how to use angle 60 degree is this equation. suggestion needed
 

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I think the statement of problem is not complete. r and θ give you the coordinates of the electron as x = r cos θ and y = r sin θ; as β = 0.5 means electron is not given to be at rest.In that case we should know the relative orientation of velocity vector of electron relative to position vector or i and j.
 

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