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Determine the electrostatic potential en...

Determine the electrostatic potential energy of a system consisting of two charges 7 `mu`C and - 2 `muC` (and with no external field) placed at (-9 cm, 0, 0) and (9 cm, 0, 0) respectively.

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The electrostatic potential energy of two charges `q_(1) q_(2)` at distance r,
where r=(9,0,0) - (-9,0,0) cm
r =18 cm = 0.18 m
`U= (kq_(1)q_(2))/(r)`
`= (9xx10^(9)xx7xx10^(-6)xx(-2)xx10^(-6))/(0.18)`
`:. U = -0.7 J`
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KUMAR PRAKASHAN-ELECTROSTATIC POTENTIAL AND CAPACITANCE-Section B Numericals
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