Multiple Point-Charges: Two Point Charges, Q₁ = -1

Multiple Choice

Multiple point-charges: Two point charges, Q₁ = -1.0 μC and Q₂ = + 4.0 μC, are placed as shown in the figure. (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²) The y component of the electric field, at the origin O, is closest to

A) 6.0 × 10^-3 N/C.
B) -6.0 × 10^-3 N/C.
C) 3.8 × 10^-3 N/C.
D) -3.8 × 10^-3 N/C.
E) 7.1 × 10^-3 N/C.