A circular coil 'A' has a radius R and the current flowing through it is I.Another circular coil 'B' has a radius 2R and if 21is the current flowing through it then the magnetic fields at the centre of the circular coil are in the ratio of

A circular coil 'A' has a radius R and the current flowing through it is I.Another circular coil 'B' has a radius 2R and if 2I is the current flowing through it then the magnetic fields at the centre of the circular coil are in the ratio of

A circular coil 'A' has a radius R and the current flowing through it is I.Another circular coil 'B' has a radius 2R and if 2I is the current flowing through it then the magnetic fields at the centre of the circular coil are in the ratio of

A circular coil 'A' has a radius R and the current flowing through it is I. Another circular coil 'B' has a radius 2R and if 2I is the current flowing through it, then the magnetic fields at the centre of the circular coil are in the ratio of

A circular loop has radius R and a current I flows through it. Another circular loop has radius 2R and a current 2I flows through it. Ratio of the magnetic fields at their centres is

A circular coil of 50 turns and radius 0.2 cm carries a current of 12 A. Find magnetic field at the centre of the coil.

A circular coil of radius r is fromed by wire of length L.If current I is flowing through it then the magnetic moment Is proportional to

If in circular coil A of radius R, current I is flowing and in another coil B of radius 2R a current 2I is flowing , then the ratio of the magnetic fields B_(A) and B_(B) , produced by them will be

A circular coil A is of radius R and current I, another circular coil 'B’ is of radius 2R and current 2I.The ratio of magnetic field B_A : B_B at their centre is—