A-LevelPhysicsD.C. circuitsMay/June 2016Paper 1 Q321 Mark
The potential difference V across a filament lamp is slowly raised from zero to its normal operating value. Which graph represents the variation with V of the current I in the lamp?
Agraph showing current (I) vs potential difference (V) curve starting from (0,0), initially linear, then bending towards the V-axis (slope decreases).
Bgraph showing current (I) vs potential difference (V) curve starting from (0,0), initially linear, then bending towards the I-axis (slope increases).
Cgraph showing current (I) vs potential difference (V) curve that starts with a linear increase and then shows current becoming constant (horizontal line).
Dgraph showing current (I) at V=0 and then increasing linearly with V (straight line from a positive I-axis intercept).
✓ Correct Answer
The correct answer is A. This question tests the candidate's understanding of d.c. circuits 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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