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what is an electro magnet?
A soft iron core placed inside a solenoid behaves like a powerful magnet when a current is passed through the This s device is called an electromagnet.it is a temporary magnet.It shows magnetism only as long as the current is passing through its coil.It can produce very strong magnetic field.The strength of an electromagnet can be easily varied by changing the strength of current or number of turns in the coil.


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