Electric Potential conducting shell

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Homework Statement


A thin, spherical, conducting shell of radius R is mounted on an isolating support and charged to a potential of [tex]-V[/tex]. An electron is then fired from point [tex]P[/tex] at a distance [tex]r[/tex] from the center of the shell. [tex](r>>R)[/tex] with an initial speed [tex]v_0[/tex] and directly towards the shell's center. What value of [tex]v_0[/tex] is needed for the electron to just reach the shell before reversing direction?


Homework Equations


[tex]\Delta u = \frac{1}{2}mv_0^2[/tex]


The Attempt at a Solution



[tex]v_0=\sqrt{\frac{2 \Delta u}{m}}[/tex]

Im not sure if this is what I should do, if so, how can I get something for [tex]\Delta u[/tex]
 

Answers and Replies

  • #2
robphy
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What is the PHYSICS underlying the "relevant equation"?
What does [tex]\Delta u[/tex] mean? and how is it related to the "Electric Potential"?
 
  • #3
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What is the PHYSICS underlying the "relevant equation"?
Conservation of Energy Kinetic Energy + Potential Energy = Constant.
What does Delta u mean? and how is it related to the "Electric Potential"?
Delta U = changes in Potential Energy
= e*V

Regards,

Nacer.
 
  • #4
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does "V" have a value?
 

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