There is an ideal dipole located at the origin and aligned along the positive y direction....

 

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There is an ideal dipole located at the origin and aligned along the positive y direction. By "ideal," we mean that it is described exactly by the electric potential V = p cos 2 Note that, in this problem, 0 is measured with respect to the y-axis. A particle of charge q > 0 and mass m is initially located on the y-axis at y = yo> 0. Its initial speed is vo. It is initially headed in an arbitrary direction, but it is observed that, after some time, it crosses the x-axis. What is the particle's speed when it crosses the x-axis? There is an ideal dipole located at the origin and aligned along the positive y direction. By "ideal," we mean that it is described exactly by the electric potential V = p cos 2 Note that, in this problem, 0 is measured with respect to the y-axis. A particle of charge q > 0 and mass m is initially located on the y-axis at y = yo> 0. Its initial speed is vo. It is initially headed in an arbitrary direction, but it is observed that, after some time, it crosses the x-axis. What is the particle's speed when it crosses the x-axis?