^{5}. An apparatus is described for measuring the ordinary Hall coefficient of ferromagnetic metals such as Ni and of ferrimagnetic semiconductors such as Fe3O4. Background. The Philosophical Magazine: A Journal of Theoretical Experimental and Applied Physics: Vol. The Hall coefficient is just the reciprocal of the total current-carrying charge in the conductor, and has the same sign as the sign of this charge. Remember to convert all of your values to metric so the problem can be solved properly. An alternating electric field at 1000 cps is used with a static magnetic field. Theoretical Background Current is the rate at which charge ﬂows and can be described as Q/t. Hall effect measurements Measurement of the hall coefficient in liquid metals by the corbino method. Consider a metal with one type charge carriers that are electrons and is a steady-state condition with no movement of charges in the y-axis direction. 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