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A force of 16n is applied to loft a ring lyimg on surface of water if radius of ring is 2m then calculate surface tension of water

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A force of 16n is applied to loft a ring lyimg on surface of water if radius of ring is 2m then calculate surface tension of water
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Surface tension T = \(\frac fl\)  (∵ l = 2πr ⇒ 4π)

T = 16/4π

T = 4/π N/m

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