Question

A current I flows along a lengthy thin walled tube of radius r with longitudinal slit of width h .find the induction of the magnetic field inside the tube under connetterti h less than r

Answer 1

the thin walled tube with a longitudinal slit can be considered equivalent to a full tube and s strip carrying the same current density in the opposite direction.
inside the tube the former does not contribute so the total magnetic field is simply that due to the strip , that is B=ûI *h/ (4π^2Rr)
where r is the distance of strip
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