A-LevelPhysicsElectric fieldsOct/Nov 2014Paper 1 Q281 Mark
The diagram shows two parallel horizontal metal plates. There is a potential difference V between the plates. [Figure 28.1] 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?
Apolarity negative, charge/mass E/g
Bpolarity negative, charge/mass g/E
Cpolarity positive, charge/mass E/g
Dpolarity positive, charge/mass g/E
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The correct answer is B. This question tests the candidate's understanding of electric fields within the Physicssyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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