A-LevelPhysicsD.C. circuits9702/12 · Feb/Mar 2016 · Q51 Mark

PQR and XYZ are wires in a circuit. A galvanometer connects Q and Y as a null indicator. [Figure 5.1] When the galvanometer reads zero, which statement is correct?

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AThe potential difference between Q and Y is infinite.

BThe potential difference between Q and Y is zero.

CThe resistance between Q and Y is infinite.

DThe resistance between Q and Y is zero.

✓ Correct answer

B: The potential difference between Q and Y is zero.

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2016 Paper 1 Variant 2, question 5.

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