UnkleRhaukus
electrostatic potential energy of a system of three charges



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UnkleRhaukus
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\[U=K\left(\frac{q_1q_2}{r_{12}}+\frac{q_1q_3}{r_{13}}+\frac{q_2q_3}{r_{23}}\right)\]

UnkleRhaukus
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right?

RajshikharGupta
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yes it is
so what?...!!

UnkleRhaukus
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so i must be pressing the wrong number on the calculator then

RajshikharGupta
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no it is not
it is valid only for point charges
so better check it !

UnkleRhaukus
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the charges are points in my question

RajshikharGupta
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then it is all right !!..

UnkleRhaukus
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now i see what i was forgetting