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U UDA Q 30. The surface tension of water...

U UDA Q 30. The surface tension of water is 75 dync/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. (a) 0.125 N (c) 0.115 N (b) 0.225 N (d) 0.130 N

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