Exam-style question
Try this first
In Millikan's experiment, what forces are balanced to determine the charge of an electron?.
- A.Gravitational force and electric force
- B.Magnetic force and electric force
- C.Frictional force and gravitational force
- D.Centripetal force and gravitational force
Model answer
What a good answer should say
- Gravitational force and electric force
Explanation
Why this works
The charge of an electron is determined by balancing the gravitational force acting on the oil droplet with the upward electric force when an electric field is applied.
Common mistake
No common mistake is linked to this question yet.