An oil drop of 12 excess electrons is held stationary under a constant electric field of `2.55×10^4 Vm^(-1)` . If the density of the oil is 1.26 gm/`cm^3` then the radius of the drop is .......... m.
Options:
(a) `9.81 xx10^(-7)`
(b) `9.29xx 10^(-7)`
(c) `9.38xx 10^(-8)`
(d) `9.34xx 10^(-8)`