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.

A 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 remaining the same. Calculate the ratio of magnetic moments of the new coil and the original coil.

A circular coil of N Turns and diameter d carries a current I. It is unwound and rewound to make another coil of diameter 2d , current I remaining the same. Calculate the ratio of the magnetic moments of the new coil and the original coil.

A circular coil of N turns and diameter d carries a current I . It is unwound and rewound to make another coil of diameter 2d , current I remaining the same . Calculate the ratio of the magnetic moments of the new coil and the original coil .

A circular coil of 'N' turns and diameter 'd' carries a current 'I'. It is unwound and rewound to make another coil of diameter '2d' and current 'I' remaining the same. Calculate the ratio of the magnetic moments of the new coil and the original coil.

A circular coil of n turns and radius R carries a current I. It is unwound and rewound to make another square coil of side ‘a’ keeping number of turns and current same. Calculate the ratio of magnetic moment of the new coil and the original coil.

A coil of n turns and radius R carries a current I it is unwound and rewound to make a new coil of radius (R )/(2) and the same current is passed through it what is the ratio of the magnetic moment of the new coil and the original coil ?

A coil of 'N turns and radius 'R' carries a current I. It is unwound and rewound to make a square coil of side 'n'having same number of turns 'N'. Keeping the current I same, find the ratio of the magnetic moments of the square coil and the circular coil.

A circular coil of n turns and radius r carries a current I. The magnetic field at the centre is

A circular coil of n turns and radius r carries a current I. The magnetic field at the center is