Ratio of magnetic field at the centre of a current carrying coil of radius R and at a distance of `3R` on its axis is

Ratio of magnetic field at the centre af a current carrying coil of radius R and at a distance of 3 R on its axis from the centre is ,

Ratio of magnetic fields at the centre of a current carrying coil of radius r and at a distance 3r on its axis is

The ratio of the magnetic field at the centre of a current carrying coil of the radius a and at distance 'a' from centre of the coil and perpendicular to the axis of coil is

The ratio of the magnetic field at the centre of a current carrying coil of the radius a and at distance 'a' from centre of the coil and perpendicular to the axis of coil is

What will be magnetic field at centre of current carrying circular loop of radius R?

What will be magnetic field at centre of current carrying circular loop of radius R?

The magnetic field at the centre of a circular current carrying coil of radius r is B^(e ) . The magnetic on its axis at a distance r from the centre is B_(a) . The value of B_(e) : B_(a) will be :