A vertical electric field of magnitude 4.9 × 10⁵ N/C just prevents a water droplet of a mass 0.1 g from falling. The value of charge on the droplet will be : (Given g = 9.8 m/s²)
(A) 1.6 × 10-⁹ C
(B) 2.0 × 10-⁹C
(C) 3.2 × 10-⁹C
(D) 0.5 × 10-⁹C"