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Two straight infinitely long current carrying wires are kept along z-axis at the coordinate (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 the x-axis will be approximately
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answer is D.

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Detailed Solution

At the centre b=0. At $x \to \infty, B \to 0$ . Between zero and zero value there will be maximum value. Along x-axis for $x > 0, B_{n e t}$ is downwards. Along x-axis for $x < 0, B_{n e t}$ is upwards.

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