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Set of pins A is made out of soft iron because iron is the most powerful ferromagnetic substance as it contains the most no. of domains.
A domain is smallest unit of a magnet.
Each and every substance contains domains in it.
The ferromagnetic substances has more domains in it as compared to others.
When the domains inside a substance are arranged in a perfect manner, then it creates a magnetic around it and the substance becomes a magnet.
When a magnet is introduced to a ferromagnetic substance, the domains inside the the substance gets arranged and the substance act as magnet.
Thats why each pin is acting like a magnet.
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