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Physics (AS & A Level) · May / June 2018 · Paper 11 · Question 34

9702Kirchhoff’s laws

In the circuit shown, the batteries have negligible internal resistance. What are the values of the currents $I_1$, $I_2$ and $I_3$?

  1. A$I_1 = -5.5\,\text{A}$, $I_2 = 1.0\,\text{A}$, $I_3 = 6.5\,\text{A}$
  2. B$I_1 = 0.5\,\text{A}$, $I_2 = 4.0\,\text{A}$, $I_3 = 3.5\,\text{A}$
  3. C$I_1 = 3.5\,\text{A}$, $I_2 = 4.0\,\text{A}$, $I_3 = 0.5\,\text{A}$
  4. D$I_1 = 6.5\,\text{A}$, $I_2 = 1.0\,\text{A}$, $I_3 = -5.5\,\text{A}$

As printed in the paper

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Correct answer: C. $I_1 = 3.5\,\text{A}$, $I_2 = 4.0\,\text{A}$, $I_3 = 0.5\,\text{A}$

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