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For the particle to remain stationary, the electric force (Fe) must balance the gravitational force (Fg). The gravitational force acts downward (Fg = mg). Since the electric field is directed downward, for the electric force to counteract gravity and be upward, the charge (q) must be negative.Fe = Fg => qE = mgq = mg / EGiven:Mass m = 5 g = 5 × 10-3 kgElectric field E = 800 N/CAcceleration due to gravity g = 9.8 m/s2q = (5 × 10-3 kg × 9.8 m/s2) / 800 N/Cq = 0.049 N / 800 N/Cq = 0.00006125 C = 61.25 × 10-6 C = 61.25 µCSince the charge must be negative, q = -61.25 µC. The closest option is -61.3 µC (assuming µF is a typo for µC).