  We report a systematic study of the stringy interaction between two sets of
Dp branes placed parallel at a separation in the presence of two worldvolume
fluxes for each set. We focus in this paper on that the two fluxes on one set
have the same structure as those on the other set but they in general differ in
values, which can be both electric or both magnetic or one electric and one
magnetic. We compute the respective stringy interaction amplitude and find that
the presence of electric fluxes gives rise to the open string pair production
while that of magnetic ones to the open string tachyon mode. The interplay of
these two leads to the open string pair production enhancement in certain cases
when one flux is electric and the other is magnetic. In particular, we find
that this enhancement occurs even when the electric flux and the magnetic one
share one common field strength index which is impossible in the one-flux case
studied previously by the present author and his collaborator in [17]. This
type of enhancement may have realistic physical applications, say, as a means
to explore the existence of extra dimensions.

High Energy Physics - Theory