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 :

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

The magnetic field at the centre of a circular current carrying conductor of radius r is B_c . The magnetic field on its axis at a distance r from the centre is B_a , The value of B_c : B_c will be

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

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 of a current carrying coil of radius R and at a distance of 3R on its axis 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 on the axis of a circular current carrying conductor of radius r at a distance r from centre is B_(a) and the magnetic field at its centre is B_(c ) . The value of B_(a) : B_(c ) is