1) how can a magnet be magnetized
2) why can't hand span and cubit be used as standard units
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1) By the process of magnetic induction ...
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1) To become magnetized, another strongly magnetic substance must enter the magnetic field of an existing magnet. ... When you rub a piece of iron along a magnet, the north-seeking poles of the atoms in the iron line up in the same direction. The force generated by the aligned atoms creates a magnetic field.
2) Hand span and cubit are not used as standard units of length because their sizes vary from person to person. So, two different persons may give different measurements for the same length, which is not desirable for a standard unit.
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