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Three parallel, current-carrying wires pass through the vertices of an equilateral triangle. Two wires carry an electric current that is going into the page, and one wire carries an electric current that is coming out of the page. The magnitudes of the currents are I = 5 A, and the side of the equilateral triangle is d = 5 cm. Find the magnitude and direction of the magnetic field in the centre of the triangle (point O). (Assume the +x-axis is towards the right, the +y-axis is upwards, and the +z-axis is coming out of the page.)
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