If $3$ charges are placed at the vertices of equilateral triangle of charge ‘$q$’ each. What is the net potential energy, if the side of equilateral triangle is $l\, cm$
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(c) $U = \frac{1}{{4\pi {\varepsilon _0}}}.\frac{{{Q_1}{Q_2}}}{r};$ net potential energy
${U_{net}} = 3 \times \frac{1}{{4\pi {\varepsilon _0}}}.\frac{{{q^2}}}{l}$
${U_{net}} = 3 \times \frac{1}{{4\pi {\varepsilon _0}}}.\frac{{{q^2}}}{l}$
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