(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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?

2. Relevant equations

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

3. 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]

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Electric Potential conducting shell

**Physics Forums | Science Articles, Homework Help, Discussion**