An oil drop of radius 2 mm with a density 3 g cm-3 is held stationary under a constant electric field 3.55 × 105 V m-1 in the Millikan's oil drop experiment. What is the number of excess electrons that the oil drop will possess?
Consider g = 9.81 m/s2
1
17.3 × 1010
2
1.73 × 1010
3
1.73 × 1012
4
48.8 × 1011