Answer / jkgjk

When we insert 3-pin plug in the socket, first longer and
thiker pin touch the plug, which is connected through earth.
This is for human protection from earth fault.

Answer / manju

thicker pin is connected through earth,as v know that as the area of connection (conductor)increses the resistance decrease
R=$L/A. incase of earth fault, current easily flow to earth through thicker earth pin. tis will protect human from shock.

Answer / rajesh tanwar

The earth pin in the socket is longer so that the phase and
nuetral get disconnected first and earth is disconnected
very last to gave a sufficient protection.

Answer / praful nandankar

earth pin is used in socket to prevent the person from
shock.earth pin is thickeras u know that the thickness is
indirectly proportional to resistance.Hence excessive
current flows through the earth pin during abnormal
conditions.

Answer / shivendra

we know that R=p(L/A).So as the area of cross section increases the resistance decreases AND the current follows the minimum resistance path.So in case of fault current excessive current will flow via earth pin thereby saving the human from shock.

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