Electromagnetism is the branch of physics that studies the relationship between electricity and magnetism. It deals with the concept of electric and magnetic fields and how they interact with each other.
A solenoid is a coil of wire that carries an electric current, creating a magnetic field. It is commonly used in electromagnets, relays, and other electrical devices.
When a current flows through a solenoid, it creates a magnetic field around it. If this solenoid is placed within an external magnetic field, the two fields will interact and either attract or repel each other, depending on their orientation.
Solenoids are used in electromagnets because they can produce a strong magnetic field with a relatively small amount of current. This makes them useful in applications where a strong magnetic field is needed, such as in motors and generators.
Some common applications of electromagnetism from solenoids within a magnetic field include electromagnets used in speakers, doorbells, and MRI machines. They are also used in devices such as electric motors, generators, and relays.