at the origin for the surface
which is a sphere of radius R.
Answer:
According to Gauss's law
in magnetism, 
To explain it as per
question, refer Fig. 3(EP). 14, magnetic moment of dipole at origin O, 
Let P be a point at distance r from
O and OP makes an angle 
with z-axis.
Component of 
along OP = M cos .
The point P
is on the axial line of dipole of magnetic moment M cos . The magnetic field induction at
P due to dipole of moment M cos is
Consider
a spherical surface of radius r with centre at O lying in y-z, plane. Take an
elementary area ds of the surface at P. Then
= 
= 
.
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