What do you think can account for the difference in field strengths at positions (50, 0) and (-50, 0)?

Newtons second law deals most cosely with

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?

Draw the structure for 5-isopropyl-2-methyl-3-nonene