Demagnetization by AC supply - why should the magnet be removed SLOWLY?

Subject: Demagnetization by AC supply - why should the magnet be removed SLOWLY?

Date: Wed Jan 27 06:58:45 1999
Posted by Michael Ho
Grade level: 10-12
School: Bukit View Sec Sch,Ministry of Education
City: Singapore State/Province: Singapore
Country: Republic of Singapore
Area of science: Physics
ID: 917441925.Ph

Message:


In demagnetisation of magnets, one method as described in some books is to place 
the magnet in a solenoid connected to an ac supply, then remove the magnet 
SLOWLY from the solenoid till about 2-3 metres away.  Why slowly?  What if it 
were removed quickly, or removed only after switching off the supply?

Re: Demagnetization by AC supply - why should the magnet be removed SLOWLY?

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