What is an electromagnet?


10:20 AM

1 min read
What is an electromagnet? Blog Image


Invented in 1824 by William Sturgeon, electromagnets are a fixture of modern life, appearing in loudspeakers, motors, magnetic resonance imaging (MRI) machines, maglev trains, and particle accelerators.


  • Electromagnets are devices that produce a magnetic field when an electric current flows through a coil of wire.
  • The magnetic field is concentrated in the hole of the coil. The strength of the magnetic field can be controlled by adjusting the electric current. When the current is turned off, the magnetic field disappears.
  • Construction and Materials: Electromagnets typically consist of a coil of wire wrapped around a magnetic core made of ferromagnetic materials like iron. The magnetic core enhances the strength of the magnetic field by aligning the magnetic domains within the core.

Properties and Advantages:

  • Electromagnets can be turned on and off by controlling the electric current.
  • They are more powerful than permanent magnets because the magnetic field can be amplified by the magnetic core.
  • Electromagnets are widely used in various devices such as motors, generators, MRI machines, and magnetic separation equipment.


  • Electromagnets are used in various industries for tasks like lifting and moving heavy metal objects, sorting materials, and generating motion.
  • They are also used in medical settings for imaging and in consumer devices like electric doorbells and card readers.


  • Electromagnets require a continuous supply of electric power to maintain their magnetic field.

They are less efficient than permanent magnets in terms of energy usage.

Q1: What is Radiation?

Radiation is the energy that is transmitted in the form of waves or particles through space or a material medium. There are several different types of radiation, including electromagnetic radiation (such as radio waves, microwaves, infrared radiation,etc) and particle radiation (such as alpha particles, beta particles, and neutrons).

Source: What is an electromagnet?