We derive the low energy dynamics of monopoles and dyons in N=2
supersymmetric Yang-Mills theories with hypermultiplets in arbitrary
representations by utilizing a collective coordinate expansion. We consider the
most general case that Higgs fields both in the vector multiplet and in the
hypermultiplets have nonzero vacuum expectation values. The resulting theory is
a supersymmetric quantum mechanics which has been obtained by a nontrivial
dimensional reduction of two-dimensional (4,0) supersymmetric sigma models with
potentials.Comment: 17pages, LaTeX, minor changes, references added, version published in
JHE