(B) dfrac (9)(2pi {c)_(0)(y)^2} - y 个-|||-P(0,y)-|||-+q-|||-(C) dfrac (qa)(2pi {varepsilon )_(0)(y)^3} . (D) dfrac (qa)(4pi {varepsilon )_(0)(y)^3} - -9-|||--a O +a x

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