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A toroidal coil has N closely-wound turns. Assume the current through the coil to be $$l$$ and the toroid is filled with a magnetic material of relative permittivity $${\mu _r}.$$ The magnitude of magnetic induction $$\overrightarrow {\bf{B}} $$ inside the toroid, at a radial distance r from the axis, is given by

A toroidal coil has N closely-wound turns. Assume the current through the coil to be $$l$$ and the toroid is filled with a magnetic material of relative permittivity $${\mu _r}.$$ The magnitude of magnetic induction $$\overrightarrow {\bf{B}} $$ inside the toroid, at a radial distance r from the axis, is given by Correct Answer $$\frac{{{\mu _r}{\mu _0}Nl}}{{2\pi r}}$$

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