P25_037 - 37. We choose the zero of electric potential to...

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Unformatted text preview: 37. We choose the zero of electric potential to be at infinity. The initial electric potential energy Ui of the system before the particles are brought together is therefore zero. After the system is set up the final potential energy is Uf = = 11 q2 1 1 11 − − +√ − − +√ 4πε0 aa 2a a a 2a 2q 2 0.21q 2 1 √ −2 =− . 4πε0 a ε0 a 2 Thus the amount of work required to set up the system is given by W = ∆U = Uf − Ui = −0.21q 2 /(ε0 a). ...
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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