C-|||-R-|||-+Q-|||-(B) dfrac (qQ)(4pi {varepsilon )_(0)R} , -dfrac (qQ)(4pi {varepsilon )_(0)R} 一 +q 0 -q D --|||-(C) -dfrac (qQ)(4pi {varepsilon )_(0)R} , dfrac (qQ)(4pi {varepsilon )_(0)R} - (D) -dfrac (qQ)(6pi {varepsilon )_(0)R} , dfrac (qQ)(6pi {varepsilon )_(0)R} 一
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