A length of wire carries a steady current I. It is bent first to form a circular plane coil
Channel: Doubtnut
Date: 2020-08-02

A length of wire carries a steady current I. It is bent first to form a circular plane coil of one turn. The same length is now bent more sharply to give double loop of smaller radius. If the same current I is passed, the ratio of the magnitude of magnetic field at the centre with its first value is: