# Physics

How much work must be done to bring three electrons from a great distance apart to 1.0 * 10^(-10)m from one another (at the corners of an equilateral triangle)?

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1. Get it by calculating the potential energy of the configuration.

It takes ke^2/a to bring the second charge within a of the first one, and 2ke^2/a to bring in the third one within a of both of the first two. That makes a total P.E. of
3 ke^2/a, and that is the work required.

k is the Coulomb constant and e is the electron charge.

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2. V=k*q/r

so for the above equation, there should without square!

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3. 1.4*10^-17

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