  The strongly interacting partonic medium created post ultrarelativistic heavy
ion collision experiments exhibits a significant temperature-gradient between
the central and peripheral regions of the collisions, which in turn, is capable
of inducing an electric field in the medium; a phenomenon known as Seebeck
effect. The effect is quantified by the magnitude of the induced electric field
per unit temperature-gradient - the Seebeck coefficient ($S$). We study the
coefficient, $S$ in the relativistic Boltzmann transport equation in
relaxation-time approximation, as a function of temperature ($T$) and chemical
potential ($\mu$), wherein we find that with current quark masses, the
magnitude of $S$ for individual flavours as well as that for the medium as a
whole decreases with $T$ and increases with $\mu$, with the electric charge of
the flavour deciding the sign of $S$. The emergence of a strong magnetic field
($B$) in the non-central collisions at heavy-ion collider experiments motivates
us to study the effect of $B$ on Seebeck effect. The strong $B$ affects $S$ in
multifold ways, via : a) modification of phase-space due to the dimensional
reduction, b) dispersion relation in lowest Landau level (occupation
probability), and c) relaxation-time. We find that a strong $B$ not only
decreases the magnitudes of $S$'s of individual species, it also flips their
signs. This leads to a faster reduction of the magnitude of $S$ of the medium
than its counterpart at $B=0$. We then explore how the interactions among
partons in perturbative thermal QCD in the quasiparticle framework affect
Seebeck effect, where we find that even in strong B, there is no more a flip of
the sign of $S$ for individual species and an enhancement of the magnitudes of
$S$ of individual species as well as that of the medium, compared to current
quark mass description at either $B=0$ or $B \neq 0$.
