Why are electric charges allowed to be so light but magnetic monopoles have to be so heavy? My question is in two parts. 


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*What is the origin of the electric field from an electric charge and why electron can have so small mass? While on the other hand for a magnetic monopole to create a magnetic field needs to be so heavy? 

*And if the magnetic monopole is a hadron what are the constituent elementary particles? What is balancing these energies so that the charges do not explode? 
A simple undergrad level answer will do.
 A: An answer that Professor Lenny Susskind gave to a non-physicist audience at Stanford in June 2012 went along these lines (by memory and some very short notes I took):

The charge on an electron is$\ \alpha \ \approx \ 1/137\ $which means
  that 99% of the electron is just the bare electron while about 1% of
  the time it is an electron plus a virtual photon.
Whereas the charge on a magnetic monopole would be $1/\alpha \ \approx \ 137$ so the
  magnetic monopole would have about 100 constituents on average - like
  lots of photons, current etc.  Thus the magnetic monopole would be a
  composite particle and very heavy due to all the strong fields and
  constituents.

Don't blame any errors on Lenny, it could be my mistaken memory/notes.  I think that the dimensionless number $\alpha$ is a reasonable stand-in for electric charge since it is the coupling constant used to calculate connections between electrons and photons.  Similarly, $1/\alpha$ would be the coupling between magnetic monopoles and photons.
