Abstract
It has been argued that electroweak baryogenesis generates a left-handed primordial magnetic field. The helicity density of the primordial magnetic field today is estimated to be \sim 10^2 n_b where n_b\sim 10^{-6} /cm^3 is the present cosmological baryon number density. With certain assumptions about the inverse cascade the field strength at recombination is \sim 10^{-13} G on a coherence scale \sim 10^{-4} pc. Here I discuss the various assumptions made in obtaining these estimates and the concomitant open issues.