A-LevelPhysicsD.C. circuitsOct/Nov 2013Paper 1 Q361 Mark
In the circuit below, P is a potentiometer of total resistance 10 Ω and Q is a fixed resistor of resistance 10 Ω. The battery has an electromotive force (e.m.f.) of 4.0 V and negligible internal resistance. The voltmeter has a very high resistance. [Figure 36.1] The slider on the potentiometer is moved from X to Y and a graph of voltmeter reading V is plotted against slider position. Which graph would be obtained?
AGraph showing V starting at 4 and decreasing linearly to 2.
BGraph showing V starting at 4 and decreasing with a curve (concave down) to 2.
CGraph showing V starting at 2 and increasing linearly to 4.
DGraph showing V starting at 4 and decreasing with a curve (concave up) to 2.
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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...
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