A-LevelPhysicsElectric fieldsFeb/Mar 2017Paper 1 Q311 Mark
A constant potential difference is applied between two horizontal metal plates. A charged oil droplet is held stationary by the electric field between the plates. [Figure showing a charged oil droplet between two horizontal metal plates] As some of the oil evaporates, the droplet loses mass and starts to accelerate. Its charge remains constant. In which direction does the droplet accelerate, and which change needs to be made to the separation of the plates in order to stop this acceleration?
Adirection of acceleration: downwards, separation of the plates: decrease
Bdirection of acceleration: downwards, separation of the plates: increase
Cdirection of acceleration: upwards, separation of the plates: decrease
Ddirection of acceleration: upwards, separation of the plates: increase
✓ Correct Answer
The correct answer is D. This question tests the candidate's understanding of electric fields within the Physicssyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
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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