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ch24_p37 - 37 We choose the zero of electric potential to...

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37. We choose the zero of electric potential to be at infinity. The initial electric potential energy U i of the system before the particles are brought together is therefore zero. After the system is set up the final potential energy is 2 2 0 0 1 1 1 1 1 1 2 1 2 . 4 4 2 2 2 f q q U a a a a a a a ε ε § · § · = + + = ¨ ¸ ¨ ¸ © ¹ © ¹ π π Thus the amount of work required to set up the system is given by (in SI units)
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