give me 3 diffrence of Single touch method and double touch method.
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single touch method
a magnetic is rubber along with the magnetism substance from one end to another and lifted vertically opposite.
2. in this an object is magnetised by single magnet.
double touch method
opposite poles of two magnets are placed next to each other at the centre of magnetic .
2. substance and Rubbed in the opposite direction.
3. in this an object is magnetised by double magnet
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