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Abstract
This paper aims to determine the stress of MR fluids in an on-state condition. Different MR fluids
samples were made and tested inside the laboratory. The variation of the yield shear stress and
viscosity with respect to magnetic field density for developed MR fluid samples is thus obtained
using three above different techniques i.e. Carlson approach, relative permeability approach and
experimental approach. The ratio of the conductivities of the MR fluid can be used to find the
shear stress of the MR fluid when activated above high magnetic fields of the range of 2 tesla. It
can be observed from these tables and figures that the results obtained from three approaches
are matching quite well among each other and are having a percentage error range from 2% to
7%.