A-LevelPhysicsD.C. circuits9702/12 · May/June 2014 · Q341 Mark

In the circuit shown, a light-dependent resistor (LDR) is connected to two resistors R₁ and R₂. The potential difference (p.d.) across R₁ is V₁ and the p.d. across R₂ is V₂. The current in the circuit is I. [Figure 34.1] Which statement about this circuit is correct?

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AThe current I increases when the light intensity decreases.

BThe LDR is an ohmic conductor.

CThe p.d. V₂ increases when the light intensity decreases.

DThe ratio V₁/V₂ is independent of light intensity.

✓ Correct answer

D: The ratio V₁/V₂ is independent of light intensity.

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2014 Paper 1 Variant 2, question 34.

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