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Fig. 4.
Notation in cylindrical polar coordinates (R, ϕ, z) for (a) an axisymmetric current sheet stretching from 
to 
and (b) a ring current of radius 
indicating the positions of a general point P(R, ϕ, z) and a point Q(R, ϕ, 0) in the plane of the ring at a radius 
.
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