In an electromagnet, what happens to the magnetic field when the current stops?

In an electromagnet, when the current stops flowing through the coil of wire, the magnetic field that was generated by the flow of that electric current dissipates. Electromagnets rely on the movement of electric charge to produce a magnetic field, so the moment the current ceases, the source of the magnetic field is removed. Consequently, the magnetic field disappears completely.

This principle is fundamental to the operation of electromagnets and distinguishes them from permanent magnets, which maintain their magnetic field without the need for an electric current. Understanding this concept helps in grasping how electromagnets are used in various applications, such as in relays and electric motors, where the ability to turn the magnetic field on and off is crucial.