Physics for the IB Diploma 6th Edition>Chapter 5 - Electricity and Magnetism>Exam-style questions>Q 10

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Two long parallel wires carry equal currents in opposite directions. What field do the two wires produce at point M, which is midway between the wires and on the plane of the paper?

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Important Questions on Electricity and Magnetism

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Physics for the IB Diploma 6th Edition>Chapter 5 - Electricity and Magnetism>Exam-style questions>Q 11

A student assigns currents at a junction in a circuit as shown in the diagram.

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The student's calculations correctly give that $I_{1} = 3 A$ and $I_{2} = - 2 A$ . The value of $I_{3}$ is: