Understanding magnetorheological fluids' tribological behavior is essential for various applications, especially under variable magnetic fields. Therefore, this work is concerned with the design of a ball on the three-plate tribometer with an electromagnet to measure the tribological properties of MR fluid at the variable magnetic field. The magnetic field simulation has been conducted using COMSOL Multiphysics software and the results have been compared with the experimental values obtained through a 3D gaussmeter. The experiment is performed to find the effect of load, speed, and magnetic field on the coefficient of friction, and it has been found that changes in load and magnetic field greatly influence the coefficient of friction. The numerical simulation of MHD (magnetohydrodynamic) for point contact has been conducted using FVM (finite volume method) and the effect of the Hartman number on the film thickness and pressure distribution has been discussed. The increase in the Hartman number improves the lubrication for the point contact.