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Two very long straight parallel wires, parallel to y-axis, carry currents 4I and I, along +y direction and –y direction, respectively. The wires are passes through the x-axis at the points (d, 0, 0) and (– d, 0, 0) respectively. The graph of magnetic field z-component as one moves along the x-axis from x = – d to x = +d, is best given by
The correct answer is:
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