Question

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Answer 1

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.