Assume charge is static (q)
Force repulsion mean
"q_1=q,q_2=q"
Between charge distance =r
"F=\\frac{kq_1q_2}{r^2}"
Put value
"F=\\frac{kq^2}{r^2}" Repulsion force
Work (W)
"W=-\\frac{kq_1q_2}{r}"
"W=-\\frac{kq^2}{r}"
∆U=W="\\frac{kq^2}{r}"
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