Potential energy of Cloze (1): the second charge due to q1a single chargethe second charge due to V(r)the configuration JXUwMDM5JXUwMDQxJXUwMDUzJXUwMDFhJXUwMDA3JXUwMDA5JXUwMDBiJXUwMDA5JXUwMDQ1JXUwMDQzJXUwMDBiJXUwMDA5JXUwMDEzJXUwMDE1JXUwMDAy ,  ie Potential energy of q1 at r in an external field   =  q1V(r)

Potential energy of Cloze (2): the second charge due to q1a single chargethe second charge due to V(r)the configuration JXUwMDJjJXUwMDFjJXUwMDBkJXUwMDQ1JXUwMDUzJXUwMDE2JXUwMDA2JXUwMDBjJXUwMDAxJXUwMDBhJXUwMDQ0JXUwMDQzJXUwMDBiJXUwMDA5JXUwMDEzJXUwMDE1JXUwMDAyJXUwMDQ1JXUwMDQ0JXUwMDExJXUwMDEwJXUwMDQ1JXUwMDU0JXUwMDFiJXUwMDRmJXUwMDc2JXUwMDdlJXUwMDVhJXUwMDVi , Work done on q2 against the external field   =  q₂ V(r₂)

Potential energy of Cloze (3): the second charge due to q1a single chargethe second charge due to V(r)the configuration JXUwMDJjJXUwMDFjJXUwMDBkJXUwMDQ1JXUwMDUzJXUwMDE2JXUwMDA2JXUwMDBjJXUwMDAxJXUwMDBhJXUwMDQ0JXUwMDQzJXUwMDBiJXUwMDA5JXUwMDEzJXUwMDE1JXUwMDAyJXUwMDQ1JXUwMDQ0JXUwMDExJXUwMDEwJXUwMDQ1JXUwMDU0JXUwMDFiJXUwMDRmJXUwMDUxJXUwMDQw , Work done on q2 against the field due to q₁   =  (q₁ q₂) ÷ (4πε₀r₁₂)

Potential energy of Cloze (4): the second charge due to q1a single chargethe second charge due to V(r)the configuration JXUwMDJjJXUwMDFjJXUwMDBkJXUwMDQ1JXUwMDQzJXUwMDBjJXUwMDAxJXUwMDA4JXUwMDBmJXUwMDBlJXUwMDEyJXUwMDA3JXUwMDEzJXUwMDE1JXUwMDFkJXUwMDA2JXUwMDAx , the total work done in assembling the configuration   =  q1V(r) + q2 V(r2) + (q₁ q₂) ÷ (4πε₀r₁₂)