How does an electromagnet become stronger when more current flows through it?
Quick Answer
Electric current creates a magnetic field, and more current usually means a stronger field. Wrapping the wire into a coil and adding an iron core can make the magnet much stronger.
The Full Story
An electromagnet works because moving electric charges produce a magnetic field. When current flows through a wire coil, the field from each loop adds together, making the overall field stronger. Inserting an iron core into the coil concentrates the field and can dramatically increase the magnet’s strength. This principle is used in cranes, relays, electric bells, and many motors. The relationship between electricity and magnetism was formalized in the 19th century by scientists such as Hans Christian Oersted and James Clerk Maxwell.
Key Facts
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"How a coil of wire becomes a powerful magnet"
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