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The illustration consists of two parallel wires of equal length l that carry currents I sub 1 and I sub 2 in the z-direction. They attract each other with equal forces F prime sub 1 and F prime sub 2. The wires are placed at a distance of d over 2 from the origin on the negative and positive y-axes respectively. A dotted circle with radius d represents the magnetic field B sub 1 around the first wire in the clockwise direction.