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Q.

Two long parallel wires are at a distance 2 d apart. They carry steady equal currents flowing out of the plane of the paper as shown. The variation of the magnetic field B along the line XX1 is given by

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a

b

c

d

answer is A.

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Detailed Solution

The magnetic field varies inversely with the distance for a long conductor. That is, B∝1dAlso, at the mid point between the wires, the net magnetic field will be zero.so, graph (a) is the correct one.
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