Concept 9 of 9Foundation
Watch on YouTubeVideoElectromagnets and their uses
Wrap an insulated wire around an iron nail. Connect wire to a cell → current flows → the nail becomes a strong magnet. Disconnect → magnetism vanishes.
That's an electromagnet: magnetism you can switch ON and OFF.
Strength depends on:
- Number of turns of wire (more = stronger)
- Current flowing (more = stronger)
- Iron core quality (soft iron is best)
Uses: electric bells, speakers, motors, cranes lifting scrap iron, MRI scanners, maglev trains.
Example
In a scrapyard, a huge electromagnet lifts a pile of steel cars. To release them into a truck, the operator simply turns off the current.
💡 Tip:Electromagnets = controllable magnetism. Can't do that with a permanent magnet.
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5 questions to check what you just read.
0 / 5
- Q1.An electromagnet is:
- Q2.Strength of electromagnet increases with:
- Q3.Scrapyard crane uses:
- Q4.Core inside an electromagnet is usually:
- Q5.Electromagnet advantage over permanent magnet: