Four long, parallel conductors carry equal 4 A currents. A cross-sectional view

Question

Four long, parallel conductors carry equal 4 A currents. A cross-sectional view of the conductors is shown in the figure below. Each side of the square has length of 0.4 m. Note: The current direction is out of the page at points indicated by the dots and into the page at points indicated by the crosses. What is the magnitude of the magnetic field at point P? Answer in units of T. What is the direction of this resultant magnetic field?

Explanation / Answer

1) because of the symmetry=> the magnetic field is zero=>B=0 2)sin B=0=> undetermined=> answer9

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