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Question
A square wire frame of side 'L' is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of liquid is T, the force acting on the frame due to the membrane will be:
A square wire frame of side 'L' is dipped in a liquid. On taking out, a membrane is formed. If the surface tension of liquid is T, the force acting on the frame due to the membrane will be:
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Solution
The correct option is B 8 TL
A perimeter of the square is 4L, on one side. So including both side, total length will be 8L.The force, if T is surface tension (for per unit length) will be 8LT.
A perimeter of the square is 4L, on one side. So including both side, total length will be 8L.
The force, if T is surface tension (for per unit length) will be 8LT.
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