Problem: Three very long, straight, parallel wires each carry currents of 4 A, directed out of the page in the drawing in Figure 3. The wires pass through the vertices of a right isosceles triangle of side 2 cm. What is the magnitude of the magnetic field at point P at the midpoint of the hypotenuse of the triangle?

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Three very long, straight, parallel wires each carry currents of 4 A, directed out of the page in the drawing in Figure 3. The wires pass through the vertices of a right isosceles triangle of side 2 cm. What is the magnitude of the magnetic field at point P at the midpoint of the hypotenuse of the triangle?