Magnetic Field Due to Current Carrying Circular Coil Special Cases

Description:

Magnetic field due to current carrying circular coil on its axis is –

If 𝒙 is far away from the center of coil:

At a very large distance when x >> a,

Considering N=1,

Hence,

B α 1/x³

This is similar to Electric Dipole.

If 𝒙 is zero i.e. point P is at centre:

Considering N=1

By observing magnetic field along the complete axis we conclude that any charge moving in the circle behaves as a magnet.

Coil behaves like a bar magnet.