Re: Magnetic Monopole?

There are some speculative cosmological theories in which
magnetic monopoles exist and play an important role.  For this and
other reasons, a group at Stanford U. has conducted a careful search
for magnetic monopoles, without finding any.  See M. E. Huber, B.
Cabrera, M. A. Taber and R. D. Gardner, Physical Review D 44, 636 (1991).

The construction you described is a sphere covered by a layer of magnetic
dipoles.  The magnetic field outside such an object (assuming it is
perfectly spherical) is zero everywhere.  The calculation is exactly the
same as for a sphere covered by a layer of electric dipoles.