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Electron Potential Energy; Speed of Proton Particle and Electron

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What is the electron potential energy in joules of of two electrons separated by 2.33nm? and what would it be if the separation was doubled?

A charged proton particle is moving rightward between two parallel charged plates separated by distance d= 6.60mm. The plate potentials are V1= -67.0 v and V2= -48.0v. The particle is slowing from an initial speed of 97.0 km/s at the left plate. What is its speed just as it reaches plate 2?

A thin spherical, conducting shell of radius R is mounted on an isolating support and charged to a potential of -799v. An electron is then fired directly toward the center of the shell, from point P at distance r from the center of the shell, ( r is greater than R). What initial speed vo is needed for the electron to just reach the shell before reversing direction?

In a shape of a square is a charge of four particles on each corner of the square.
In the order of positive, negative, positive, negative. How much work in joules is required to set up the four charge configuration if q= 1.62pC, a= 77.1cm, and the particles are initially infinitely far apart and at rest?

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The solution determines the electron potential energy, speed of proton particle and electron.

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