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 22 00 11 1 11 1 2 1 2. 44 2 f qq U aa a εε §· § · = −−+ = ¨¸ ¨ ¸ ©¹ ©
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