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Q.

Two long parallel wires are at a distance 2d apart. They carry steady equal currents flowing out of the plane of the paper, as shown. The variation of magnetic field B along the line XX’ is given by

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a

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b

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c

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d

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answer is B.

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Detailed Solution

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Left of A: Magnetic field is downward
Right of B: Magnetic field id upward
At mid-point AB. Magnetic field is zero
Near the wire, B→∞ 
At large distance from wire, B→0

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