16.(a) For a circular coil of radius R and N turns carrying current I, the magnitude of the magnetic field at a point on its axis at a distance x from its centre is given by,
Show that this reduces to the familiar result for the field at the centre of the coil.
For a circular coil of radius R and N turns carrying current I, the magnitude of the magnetic field at a point on its axis at a distance x from its centre is given by,
For finding the field at the centre of coil we put x=0 and get the familiar result