Why did earth pin larger than other pins ?

It depends upon R=ρL/A where area (A) is
inversely proportional to resistance (R), so if
area (A) increases, R decreases & if R is less
the leakage current will take low resistance path
so the earth pin should be thicker.
It is longer because the The First to make the connection
and last to disconnect should be earth Pin. This
assures Safety for the person who uses the
electrical instrument.

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