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A straw 6cm long floats on water.The water film on one side has surface tension of 50 dyne/cm. on the other side, camphor reduces the surface tension to 40 dyne /cm . The resultant force acting on the straw is

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10 dyne

60 dyne

30 dyne

0 dyne

answer is A.

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Detailed Solution

$\vec{F} = {\vec{F}}_{1} + {\vec{F}}_{2} = (T_{1} - T_{2}) l$

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