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Physics (AS & A Level) · Feb / March 2020 · Paper 12 · Question 35

9702Practical circuits

Two batteries are connected together, as shown. Battery 1 has electromotive force (e.m.f.) 12 V and internal resistance 0.3 Ω. Battery 2 has e.m.f. 9 V and internal resistance 0.1 Ω. What are the e.m.f. and the internal resistance of a single battery that has the same effect as the combination?

  1. Ae.m.f. 3 V, internal resistance 0.2 Ω
  2. Be.m.f. 3 V, internal resistance 0.4 Ω
  3. Ce.m.f. 21 V, internal resistance 0.2 Ω
  4. De.m.f. 21 V, internal resistance 0.4 Ω

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Correct answer: B. e.m.f. 3 V, internal resistance 0.4 Ω

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