The ratio of magnetic inductions at the centre of a circular coil of radius a and on its axis at a distance equal to its radius, will be-

The intensity of magnetic induction at the centre of a current - carrying circular coil is B_(1) and at a point on its axis at a distance equal to its radius from the centre is B_(2) , then B_(1)//B_(2) 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

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

The ratio of magnetic induction at a point along the axis of a circular coil of radius a at a distance x to a point where x tends to zero is [x gt gt a]

The ratio of magnetic induction at a point along the axis of a circular coil of radius a at a distance x to a point where x tends to zero is [x gt gt a]

The ratio of magnetic induction at a point along the axis of a circular coil of radius 'a' at a distance x to a point where x tends to zero is [x>>a]

If B is the magnetic induction, at the centre of a circular coil of radius 'r' carrying a current is 1T , then its value at a distance of sqrt(3)r on the axis from the centre of the coil is