Definition: An electromagnet is a temporary magnet where the magnetic field is produced by an electric current.
Core Components: It typically consists of a coil of insulated wire (solenoid) wrapped around a core of ferromagnetic material (like iron).
Operation Principle: When current flows through the coil, it creates a magnetic field (Oersted's discovery). The core intensifies this field greatly.
Control: A key advantage is the ability to easily turn the magnetism on and off and vary its strength by controlling the electric current.
Applications: They are essential in devices like electric motors, speakers, heavy-duty lifting cranes, and high-tech equipment like MRI machines.
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