GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Viscosity
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Boyle’s Law
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Gravitational force
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Capillarity and surface tension
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Detailed explanation-1: -The ballpoint pen work on the principle of surface tension. The surface tension of the ink will decide how effectively it spreads itself over the ball. If the surface tension is too high, the ink won’t spread over the ball properly however if the surface tension is too low, the ink will get spoiled on the paper.
Detailed explanation-2: -In a ballpoint pen, a ball is fixed in the tip of the pen. Ball is rotated by the friction with paper. Due to the capillary action (the gap between ball and ball holder is min) the ink flows between ball and ball holder and it is printed on the paper. This capillary action is due to the surface tension.
Detailed explanation-3: -Pen is fitted with a tiny ball bearing in its tip. As the pen moves along the paper, the ball rotates picking up ink from the ink cartridge and leaving it on the paper. So Answer is SURFACE TENSION.
Detailed explanation-4: -Ball pen functions on the principle of capillarity and surface tension.