A-LevelPhysicsD.C. circuits9702/12 · Oct/Nov 2014 · Q301 Mark

B₁, B₂ and B₃ are three identical lamps. They are connected to a battery with zero internal resistance, as shown. [Figure 30.1] Initially the switch is closed. The switch is then opened and lamp B₃ goes out. What happens to the brightness of lamps B₁ and B₂ when the switch is opened?

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Abrightness of lamp B₁ decreases, brightness of lamp B₂ decreases

Bbrightness of lamp B₁ decreases, brightness of lamp B₂ increases

Cbrightness of lamp B₁ increases, brightness of lamp B₂ decreases

Dbrightness of lamp B₁ increases, brightness of lamp B₂ increases

✓ Correct answer

B: brightness of lamp B₁ decreases, brightness of lamp B₂ increases

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Topic: D.C. circuits, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2014 Paper 1 Variant 2, question 30.

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