A-LevelPhysicsD.C. circuitsMay/June 2015Paper 1 Q361 Mark
A potential divider circuit consists of fixed resistors of resistance 2.0 Ω and 4.0 Ω connected in series with a 3.0 Ω resistor fitted with a sliding contact. These are connected across a battery of e.m.f. 9.0 V and zero internal resistance, as shown. [Figure showing a 9.0V battery, a 4.0Ω resistor, a 2.0Ω resistor, and a 3.0Ω variable resistor (potentiometer). The output voltage is taken across a portion of the 3.0Ω resistor and the 2.0Ω resistor, in parallel with the 4.0Ω resistor.] What are the maximum and the minimum output voltages of this potential divider circuit?
Amaximum voltage/V: 4.0, minimum voltage/V: 2.0
Bmaximum voltage/V: 5.0, minimum voltage/V: 2.0
Cmaximum voltage/V: 9.0, minimum voltage/V: 0
Dmaximum voltage/V: 9.0, minimum voltage/V: 2.0
✓ Correct Answer
The correct answer is B: maximum voltage/V: 5.0, minimum voltage/V: 2.0
📋 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...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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