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Physics (AS & A Level) · Oct / Nov 2017 · Paper 11 · Question 37

9702Kirchhoff’s laws

A cell of electromotive force E and negligible internal resistance is connected to a network of resistors of resistances R1, R2, R3 and R4 as shown. The branches of the circuit have currents I1, I2 and I3. Which equation is correct?

  1. AI1R1 + I2R2 = I3R3 + I3R4
  2. BI2R2 – I3R4 – I3R3 = 0
  3. CE = I1R1 + I2R2 + I3R3 + I3R4
  4. DE = I1R1 + I2R2 – I3R3 – I3R4

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Correct answer: B. I2R2 – I3R4 – I3R3 = 0

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