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Inside of the charger an electronic circuit will be there and this circuit may be made up of diodes. If you insert this into socket in reverse direction the diodes will get reverse biased. so that they will not work in reverse direction.

Finally what I am saying is the third pin (plastic pin) will guide you to insert the charger in proper direction into the socket.

its...

your murthy

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Q: Why is one pin plastic in a mobile charger?
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