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Physics (AS & A Level) · May / June 2021 · Paper 13 · Question 37

9702Kirchhoff’s laws

A battery of electromotive force (e.m.f.) E and negligible internal resistance is connected to four resistors of resistances R1, R2, R3 and R4. The currents I1 and I2 in the resistors are as shown. Which equation is correct?

  1. A0 = I1(R1 + R2) + I2(R3 + R4)
  2. B0 = I1(R1 + R2) – I2(R3 + R4)
  3. CE = I1(R1 + R2) + I2(R3 + R4)
  4. DE = I1(R1 + R2) – I2(R3 + R4)

As printed in the paper

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Correct answer: B. 0 = I1(R1 + R2) – I2(R3 + R4)

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