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Consider three infinitely long, straight and coplanar wires which are placed parallel to each
other. The distance between the adjacent wires is d. Each wire carries a current I in the
same direction. Consider points on either side of the middle wire where the magnetic field
vanishes. What is the distance of these points from the middle wire?
2d
(a)
3
2d
(b)
d
(c)
3
d
(d)
V3

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