In Lorentz Field Electrical Impedance Tomography (LFEIT), ultrasound waves are transmitted to a tissue under static magnetic field. Magnetic fields of currents generated in boundaries where conductivity difference exists because of vibrations are measured with coils. In this study, a static magnetic field is created with permanent magnets and magnetic core for LFEIT. The contribution of magnetic core to the created magnetic flux density is demonstrated. Based on these simulation studies magnetic core is designed. To safely assemble the magnets and the core, force and torque calculations are performed in COMSOL Multiphysics. Consequently based on these calculations appropriate devices are designed for the assembly. The distribution of magnetic flux density in the air gap of core is evaluated numerically and experimentally. The relative error of magnetic flux density between the numerical and experimental values is provided. The maximum relative error is around 10.47% among 120 points where magnetic flux density is measured.