41. We choose the zero of electric potential to be at infinity. The initial electric potential energy Uiof the system before the particles are brought together is therefore zero. After the system is set up the final potential energy is 220011 1 11 1212.442fqqUaaaεε⎛⎞⎛⎞=−−+=−⎜⎟⎜⎟⎝⎠⎝⎠
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