Question: A thin, spherical, conducting shell of radius R is mounted on an isolating support and charged to a potential of 125 V. An electron

A thin, spherical, conducting shell of radius R is mounted on an isolating support and charged to a potential of – 125 V. 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 > R). What initial speed us is needed for the electron to just reach the shell before reversing direction?

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