A-LevelPhysicsD.C. circuits9702/12 · Oct/Nov 2018 · Q381 Mark

Two cells are investigated using a potentiometer. At the balance point, cell X gives a reading of 44 cm and cell Y gives a reading of 70 cm. [Figure 38.1, 38.2] Which statement is not correct?

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Apotentiometer balance point results in zero current through the galvanometer.

BAt the balance point, the current through resistor R in both circuits is the same.

CThe electromotive force (e.m.f.) of cell X is larger than that of cell Y.

DThe value of the e.m.f. of each of the cells X and Y is less than 6V.

✓ Correct answer

C: The electromotive force (e.m.f.) of cell X is larger than that of cell Y.

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2018 Paper 1 Variant 2, question 38.

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