Two straight infinitely long current carrying wires are kept along $z-$ axis at the coordinates $(0, a, 0)$ and $(0, -a, 0)$ respectively as shown in the figure. The current in each of the wire is equal and along negative $z-$ axis (into the plane of the paper). The variation of magnetic field on the $x-$ axis will be approximately
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- B
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Diffcult
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