Exam-style question
Try this first
In Millikan's oil-drop experiment, how does the balance of forces allow for the determination of the charge of an electron?.
Model answer
What a good answer should say
- In Millikan's oil-drop experiment, the charge of an electron is determined by balancing the gravitational force acting on the oil drop with the electric force exerted by an electric field.
- By adjusting the electric field until the drop is suspended, the charge can be calculated using the equation Q = mg/E, where Q is the charge, m is the mass of the drop, g is the acceleration due to gravity, and E is the electric field strength.
Explanation
Why this works
This answer effectively explains the principle behind Millikan's experiment and how the balance of forces is used to calculate the charge of an electron. It tests the student's ability to connect experimental methods with theoretical concepts.
Common mistake
No common mistake is linked to this question yet.