Physics (AS & A Level) · May / June 2017 · Paper 11 · Question 31
9702Electric fields and field lines
The diagram shows two parallel horizontal metal plates. The top plate is positively charged and the bottom plate is earthed. A small charged liquid drop, midway between the plates, is held in equilibrium by the combination of its weight and the electric force acting on it. The acceleration of free fall is g and the electric field strength is E. What is the polarity of the charge on the drop, and the ratio of charge to mass of the drop?
- Anegative, E/g
- Bnegative, g/E
- Cpositive, E/g
- Dpositive, g/E
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Correct answer: B. negative, g/E
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