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Q.

The surface tension of water is 75 dyne/cm. The circumference of the ring is 20 cm and its weight is 0.1 N. The minimum vertical force required to pull a thin wire ring up (refer figure) if it is initially resting on a horizontal water surface is, $F = (0.1 + \frac{5 x}{1000})$ N. Find $x$ .

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Detailed Solution

$F = 0.1 + 2 S l$
Liquid will have 2 surface in contact with ring

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The surface tension of water is 75 dyne/cm. The circumference of the ring is 20 cm and its weight is 0.1 N. The minimum vertical force required to pull a thin wire ring up (refer figure) if it is initially resting on a horizontal water surface is, F=(0.1+5x1000) N. Find x.