A-LevelPhysicsElectric fields9702/12 · Oct/Nov 2016 · Q311 Mark

An oil drop has mass m and charge q. The drop is held stationary in an electric field between two parallel horizontal plates, distance d apart, as shown. [Figure 31.1] The potential difference between the plates is V and the acceleration of free fall is g. What is the charge-to-mass ratio q/m of the oil drop?

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Agd/V

BV/(dg)

CgV/d

Dd/(Vg)

✓ Correct answer

A: gd/V

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Topic: Electric fields, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2016 Paper 1 Variant 2, question 31.

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