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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
− − +√ − − +√
2a a a
√ −2 =−
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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