An electromagnet is a type of magnet that is created by passing an electrical current through a wire. This current generates a magnetic field around the wire, making it act like a magnet.
An electromagnet can produce varying magnetic flux by changing the strength of the electrical current passing through the wire. The stronger the current, the stronger the magnetic field and the higher the magnetic flux.
The strength of an electromagnet's magnetic flux is affected by the number of turns in the wire, the amount of current passing through the wire, and the material of the core around which the wire is wrapped.
Electromagnets with varying magnetic flux are used in a variety of applications, such as MRI machines, electric motors, generators, speakers, and magnetic levitation trains.
The lifting power of an electromagnet is directly proportional to its magnetic flux. The higher the magnetic flux, the stronger the electromagnet will be and the more weight it can lift.