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A toroidal ring, made from a bar of leng...

A toroidal ring, made from a bar of length (l) 1 m and diameter (d) 1 cm, is bent into a circle. It is wound tightly with 100 turns per cm. If the permeability of bar is equal to that of free space `(mu_0)`, calculate the magnetic field inside the bar (B) when the current (*) circulating through the turns is 100 A. Also determine the self¬ inductance (L) of the coil.

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