The tip of pin is sharp to have ease in penetrating it. It is made thiner and sharper so that it acquire less area so that amount of force is required is minimised. Exactly opposite at other at head to prevent it from penetration.
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The tip of pin is sharp to have ease in penetrating it. It is made thiner and sharper so that it acquire less area so that amount of force is required is minimised. ... Hence lesser the area lesser the force required for penetration.
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