When Millikan observed oil drops hovering at rest in his chamber, ...

[Garrulous]

When Millikan observed oil drops hovering at rest in his chamber, he knew that
 
  A) an upward electric force balanced the weight of each drop.
  B) each drop was in mechanical equilibrium.
  C) the net force on each drop was zero.
  D) all of the above
  E) none of the above

Question 2

What did Millikan measure in his oil-drop experiment?
 
  A) the electric charge of an electron
  B) the mass of an electron
  C) the mass of oil drops
  D) none of the above

[tmlewis4706]

Answer to Question 1

Muchas Gracias

Answer to Question 2

Answer: A

[Garrulous]

TYSM

[strudel15]

Thanks for the timely response, appreciate it