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Question
Two matchsticks are laid side-by-side on the surfaces of water. When a drop of light oil on the end of a third match stick is touched to the surface film between the two floating sticks, the two match sticks :
Two matchsticks are laid side-by-side on the surfaces of water. When a drop of light oil on the end of a third match stick is touched to the surface film between the two floating sticks, the two match sticks :
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Solution
The correct option is A will move apart rapidly
Consider both of the two matchsticks. Since oil has lower surface tension than water, the matchstick is attracted more towards the water side, that is, away from the oil side and thus they move apart rapidly.
Consider both of the two matchsticks. Since oil has lower surface tension than water, the matchstick is attracted more towards the water side, that is, away from the oil side and thus they move apart rapidly.
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