A mass spectrometer uses sulfur isotopes of mass numbers 32, 33, and 34 from a meteorite sample. The directions of the electric field between the plates and the magnetic fields are shown below. The marks formed by singly charged ions of each type on a detector film are equally spaced based on this expression: $2r=\frac{2mE}{qBB^{\prime }}$. Does it matter if the ion charge is positive (lost electrons) or negative (gained electrons)? Explain.