Two pin get attracted by bar magnet maintain a distance between their ends why?

Explanation:

The pins will be magnetized so that there tips are south poles and their heads are north poles. Since the heads are all north poles and like poles repel, the heads will be repelled form each other.

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firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.