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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A current I flows through a thin wire shaped as regular polygon of n sides which can be inscribed in a circle of radius R . The magnetic field induction at the centre of polygon due to one of the polygon is

A current I flows through a thin wire shaped as regular polygon of n sides which can be inscribed in a circle of radius R . The magnetic field induction at the centre of polygon due to one of the polygon is

A wire of length l is used to form coil . THe magnetic field at its centre for a given current in it minimum if the coil has