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Physics (AS & A Level) · May / June 2024 · Paper 11 · Question 36

9702Kirchhoff’s laws

The diagram shows a circuit with a cell and three resistors with resistances R1, R2 and R3. The cell has negligible internal resistance. The total resistance of the circuit is RT. Which equation for RT is correct?

  1. ART = R1 + R2 + R3
  2. BRT = 1/(R1 + R2) + 1/R3
  3. C1/RT = 1/(R1 + R2 + R3)
  4. D1/RT = 1/(R1 + R2) + 1/R3

As printed in the paper

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Correct answer: D. 1/RT = 1/(R1 + R2) + 1/R3

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