Two thin long straight wires are parallel to each other at a separation r apart and they carry current I each along the same directions as shown then induction of magnetic field B, between the wires, varies with x according to
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a
b
c
d
answer is B.
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Detailed Solution
If we consider a point very close to one wire than magnetic field due to this wire will dominate.B =kx-kd-x where k = μoi2π