14 A point charge Q=-500 nC and two unknown point charges, q₁ and q₂, are placed as shown. The electric field at the origin O, due to charges Q, q₁ and q₂ is equal to zero. The charge q₁, in nC, is closest to:
(A)120
(B)-120
(C)-210
(D)250

(E)210

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