Two long parallel wires are at a distance 
apart. They carry steady equal currents flowing out of the plane of the paper as shown in Fig. The variation of magnetic field 
along the line 
is given by
Text Solution
Verified by ExpertsB
If the current flows out of the paper, the magnetic field at points to the right of the wire will be upwards and to the left will be downwards, as shown in the figure.
Now, let us
come to the problem.
Magnetic field at 
Magnetic field in region BX' will be upwards (+ve) because all points lying in this region are to the right of both the wires.
Magnetic field in region AC will be upwards (+ve), because points are closer to A, compared to B. Similarly magnetic field in region BC will be downwards (-ve).
This graph satisfies all these conditions. It is correct answer
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