A tiny spherical oil drop carrying a net charge q is

Last updated: 6/9/2023

A tiny spherical oil drop carrying a net charge q is balanced in still air with a vertical uniform electric field of strength x10 Vm 81 7 When the field is switched off the drop is observed to fall with terminal velocity 2 x 10 ms Given g 9 8 ms 2 viscosity of the air 1 8 x 10 5 Ns m2 and the density of oil 900 kg m 3 the magnitude of q is A 1 6 x 10 19 C B 3 2 x 10 19 C C 4 8 x 10 19 C D 8 0 x 10 19 C