A-LevelPhysicsElectric fields9702/12 · Oct/Nov 2014 · 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?

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Apolarity negative, charge/mass E/g

Bpolarity negative, charge/mass g/E

Cpolarity positive, charge/mass E/g

Dpolarity positive, charge/mass g/E

✓ Correct answer

B: polarity negative, charge/mass g/E

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Topic: Electric fields, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2014 Paper 1 Variant 2, question 28.

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