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At the three vertices of an equilateral ...

At the three vertices of an equilateral triangle of side 10 cm,`+1.0 xx 10^(-7)C, +2.0 xx 10^(-7)C and -4.0 xx 10^(-7)C` charges are placed. Calculated the potential energy of the system of these charges.

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The correct Answer is:
`-9 xx 10^(-3)J`
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