Relating to the magnetizing properties of a material especially an electromagnet; which is first magnetized & demagnetized we can notice a delay or lagging in magnetic material known as magnetic hysteresis. The lagging of magnetic flux density (B) behind the magnetic field strength (H) is very interesting using different types of soft / hard ferromagnetic materials. Our software automatically tracks the B-H curve for soft iron core material which is used in electromagnet. As we know, when magnetic field increases; as we increase the current in dc power supply magnetic flux density also increases in the electromagnetic slot which is measured automatically using gauss probe provided in the slot. Flux density reaches a maximum & saturated as we can see in hysteresis loop however magnetic field goes to further increment.