Electric field intensity(E) = Forcecharge\frac{\text{Force}}{\text{charge}}chargeForce = Fq\frac{F}{q}qF
q = 4μC = 4.0 x 10−6^{-6}−6C
F = 8N
E = 84.0×10−6\frac{8}{4.0 \times 10^{-6}}4.0×10−68 = 2.0 x 106^66NC−1^{-1}−1