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

Quizplus · Accepted Answer

Millikan observed oil drops that were hovering at rest in his chamber. This meant that the net force on each drop was zero, and the drops were in mechanical equilibrium. Additionally, since the drops were being held aloft by an electric force, we know that an upward electric force balanced the weight of each drop. Therefore, all of the above choices apply.

When Millikan Observed Oil Drops Hovering at Rest in His