The surface tension of water is 75 dyne/cm. Find the minimum vertical force required to pull a thin wire ring up (refer figure) if it is initially resting on a horizontal water surface. The circumference of the ring is 20 cm and its weight is 0.1 N

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0.125 N

0.225 N

0.115 N

0.130 N

answer is D.

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Detailed Solution

The thin ring is in contact with water from both inside and outside. So, contact length is 2x20 = 40 cmFmin = FST+W = (75×10-5)×40+0.1 = 0.130 N

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