A-LevelPhysicsD.C. circuitsOct/Nov 2014Paper 1 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?
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
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The correct answer is B. This question tests the candidate's understanding of d.c. circuits within the Physicssyllabus. The examiner's mark scheme requires...
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