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Two long parallel wires are at a distance 2 \mathrm{~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 \mathrm{ X X^{\prime}} is given by

Option: 1


Option: 2


Option: 3


Option: 4


Answers (1)

best_answer

If the current flows out of the paper, the magnetic field at points to the right of the wire will be upwards & to the left will be downwards as shown in figure.

Now let us come to the problem.
Magnetic field at  \mathrm{C}=0
Magnetic field in region BX' will be upwards (+ve) because all points lying in this region are to the right of both the wires.

Similary
Magnetic field in region AX will be downwards (-ve)
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).
Graph (B) satisfies all these conditions. Therefore correct answer is (B).

Posted by

himanshu.meshram

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