A-LevelPhysicsElectric fields9702/12 · Oct/Nov 2009 · Q271 Mark

The diagram shows two parallel horizontal metal plates held at a potential difference V. [Figure 27.1] 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 ratio of the charge to mass of the drop, and the polarity of the charge on the drop?

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Acharge/mass: g/E, polarity: positive

Bcharge/mass: g/E, polarity: negative

Ccharge/mass: E/g, polarity: positive

Dcharge/mass: E/g, polarity: negative

✓ Correct answer

B: charge/mass: g/E, polarity: negative

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Topic: Electric fields, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2009 Paper 1 Variant 2, question 27.

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