in stroking mathod of magnetising, why is the permanent magnet lifted high above after every stroke?
Answers
Answer:
Stroking Method

Procedure:
The steel bar is stroked with the same pole of the permanent magnet from one end to the other end in one direction.
The stroking magnet has to be lifted sufficiently high above the steel bar between successive strokes.
The steel bar will become a magnet with pole produced at the end where the strokes finish is opposite to the stroking pole used as the atomic magnets in the domain are attracted to the stroking pole.
Note:
When using two magnets, the stroking pole used in each magnet has to be opposite, and they stroke the steel bar in opposite direction.
Using two magnets to stoke is fasterthan that using one magnet.
Stroking method only produces weak magnets.
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Electrical Method using a direct current
Procedure:
Connect the solenoid to a direct current (d.c) supply.
Place the steel bar inside the solenoid.
Switch on the d.c supply.
When current flows through the solenoid, a strong magnetic field is produced which magnetise the steel bar.
The pole of the magnetized steel bar is determined by Right Hand Grip Rule.

Note:
Solenoid is made up of several hundred turns of copper wire.
Electrical method is the most effective method of magnetization. It is much quicker than stroking method and produces strong magnets.
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Next: Right Hand Grip Rule
Stroking Method
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