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Electrostatic potential energy of a two-charge configuration

This type of question, asked 2 times: 23 Jan 2025, 23 Jan 2026 S2. All 2 questions below, oldest first.

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  1. Question 1

    23 Jan 2025

    77
    Two charges 7μc7\mu c and −4μc- 4\mu c are placed at (−7 cm( - 7\text{ }cm, 0,0 ) and ( 7 cm,0,07\text{ }cm,0,0 ) respectively. Given, ϵ0=8.85×10−12C2 N−1 m−2\epsilon_{0}= 8.85 \times10^{- 12}C^{2}{\text{ }N}^{- 1}{\text{ }m}^{- 2}, the electrostatic potential energy of the charge configuration is :

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  2. Question 2

    23 Jan 2026 S2

    7
    Two charges 7μC7\mu C and −2μC- 2\mu C are placed at (−9,0,0)cm( - 9,0,0)cm and (9,0,0)cm(9,0,0)cm respectively in an external field E=Ar2r^E =\frac{A}{r^{2}}\widehat{r}, where A=9×105 N/C.m2A = 9 \times10^{5}\text{ }N/C.m^{2}. Considering the potential at infinity is 0 , the electrostatic energy of the configuration is ____\_\_\_\_ J.

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