A-LevelPhysicsElectric fields9702/12 · Feb/Mar 2020 · Q311 Mark

A negatively charged oil drop is held stationary, equidistant between two plates connected to a high voltage supply, as shown. [Figure showing a negatively charged oil drop held stationary between two parallel plates, with the top plate positive and bottom plate negative] Which change would not increase the upward electrical force on the drop?

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Adecreasing the distance between the plates whilst keeping the drop equidistant from them

Bincreasing the amount of negative charge on the drop

Cincreasing the supply voltage

Dmoving the drop closer to the positive plate

✓ Correct answer

D: moving the drop closer to the positive plate

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Topic: Electric fields, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2020 Paper 1 Variant 2, question 31.

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