A circular coil of N turns and radius R carries a current I. It is unwound and rewound to make anoth
Channel: Doubtnut
Date: 2020-01-19

A circular coil of N turns and radius R carries a current I. It is unwound and rewound to make another coil of radius `R//2.` Current I remaining the same. Calculate the ratio of the magnetic moments of the new coil and the original coil.