  We study the effect of a constant magnetic field on the imaginary part of a
quarkonia potential in a strongly-coupled $\mathcal{N}=4$ SYM plasma. We
consider the pair axis to be aligned perpendicularly and parallel to the
magnetic field, respectively. For both cases, we find that the presence of the
magnetic field tends to enhance the imaginary potential thus decreasing the the
thermal width. In addition, the magnetic field has a stronger effect on the
imaginary potential when the pair axis is perpendicular to the magnetic field
rather than parallel.
