Single-stroke method and double-stroke method

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Single stroke method
Double stroke method
When using two magnets, the stroking pole used in each magnet has to be opposite, and they stroke the steel bar in opposite direction The process of magnetising a steel bar by simultaneously stroking it with two poles of a horseshoe magnet or with two opposite poles of two bar magnets
The magnet is rubbed over the bar (iron bar) in the same direction in the single-touch method. In a double-touch method, an iron bar is magnetised by stroking it with two opposite poles of two bar magnets at the same time.
In the single-touch method, a magnetic material is taken and placed horizontally on a surface. The north pole or south pole of a magnet is used to touch or stroke the surface of the magnetic material from one end to the other in one direction In the double-touch method, two permanent magnets are used for touching or stroking. The north pole of one magnet and the south pole of the other magnet are placed at the middle of the magnetic material for stroking

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Single stroke method	Double stroke method
When using two magnets, the stroking pole used in each magnet has to be opposite, and they stroke the steel bar in opposite direction	The process of magnetising a steel bar by simultaneously stroking it with two poles of a horseshoe magnet or with two opposite poles of two bar magnets
The magnet is rubbed over the bar (iron bar) in the same direction in the single-touch method.	In a double-touch method, an iron bar is magnetised by stroking it with two opposite poles of two bar magnets at the same time.
In the single-touch method, a magnetic material is taken and placed horizontally on a surface. The north pole or south pole of a magnet is used to touch or stroke the surface of the magnetic material from one end to the other in one direction	In the double-touch method, two permanent magnets are used for touching or stroking. The north pole of one magnet and the south pole of the other magnet are placed at the middle of the magnetic material for stroking