Explain why the core of the electro magnet used in an electronic bell mist not be made from steel. (The electro magnet is from a circuit)

The radiation of the fire causes the saucepan to heat up. the conduction of the saucepan then to distribute the heat over the saucepan and to give heat to the water. the convection of the water distributing the heat within the water, till all the water is boiling

Answervery cold;