A-LevelPhysicsD.C. circuits9702/12 · May/June 2011 · Q371 Mark

The diagram shows a fixed resistor and a light-dependent resistor (LDR) in series with a constant low-voltage supply. When the LDR is in the dark, the fixed resistor and the LDR have the same value of resistance. Light is shone on the LDR. What happens to the potential differences across the two components?

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Ap.d. across resistor: decreased, p.d. across LDR: increased

Bp.d. across resistor: increased, p.d. across LDR: decreased

Cp.d. across resistor: no change, p.d. across LDR: increased

Dp.d. across resistor: no change, p.d. across LDR: decreased

✓ Correct answer

B: p.d. across resistor: increased, p.d. across LDR: decreased

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2011 Paper 1 Variant 2, question 37.

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