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What is the escape speed for an electron initially at rest on the surface of a...

What is the escape speed for an electron initially at rest on the surface of a sphere with radius R and a uniformly distributed (positive) charge Q? That is, what initial speed must the electron have in order to reach an infinite distance from the sphere and have zero kinetic energy when it gets there? The charge of an electron is -e and its mass is me. State your answer in terms of the given variables, using ε0 if needed.

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