Exam-style question
Try this first
In Millikan's oil-drop experiment, how does the balance of gravitational and electric forces allow for the determination of the charge of an electron?.
Model answer
What a good answer should say
- The charge of an electron can be determined by balancing the gravitational force acting on the oil drop with the electric force exerted by an electric field.
- When the forces are equal, the charge can be calculated using the formula 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 is strong because it clearly explains the relationship between the forces acting on the oil drop and how they relate to the measurement of charge. It tests the understanding of the principles behind Millikan's experiment and the concept of force balance.
Common mistake
No common mistake is linked to this question yet.