A steel magnet is placed inside a coil of wire. There is a large alternating current in the coil. The magnet is slowly moved out of the coil to position P.
How has the steel changed, if at all, when it reaches position P?
1 )
It has become a stronger magnet.
It has become demagnetised.
3 )
The poles have changed ends.
4 )
There has been no change.
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