A coil having `N` turns is would tightly in the form of a spiral with inner and outer radii a and `b` respectively. When a current `I` passes through the coil, the magnetic field at the centre is.

A coil having N turns is wound tightly in the form of a spiral with inner and outer radii a and b respectively. When a current I passes through the coil, the magnetic field at the centre is

A coll having N turns is wound tightly in the form of a spiral with inner and outer radii a and b respectively when a current I passes through the coll , the magnetic field at the centre is

A coil having N turns is wound tightly in the form of a spiral with inner and outer radii a and b respectively. A current I passes through the coil. The magnetic moment of the spriral is

A coil of n number of turns is wound tigtly in the form of a spiral with inner and outer radii a and b respectively. When a current of strength I is passed through the coil, the magnetic field at its centre is

A coil having N turns is wound tightly in the form of a spiral with inner and outer radii 'a' and 'b' respectively. Find the magnetic field at centre, when a current I passes through coil:

A toroidal coil has 3000 turns. The inner and outer radii are 10 cm and 12 cm respectively. If current flowing is 5 A, then the magnetic field inside the toroid will be

A toroidal coil has 3000 turns. The inner and outer radii are 10 cm and 12 cm respectively. If current flowing is 5 A, then the magnetic field inside the toroid will be