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34. A thin metal disc of radius r floats on water surface and bends the surface downwards along the perimeter making an angle θ with vertical edge of the disc. If the disc displaces a weight of water W and surface tension of water is T, then the weight of metal disc is

(a)    2πrT + W

(b)  2πrT COSθ – W

(c) 2πrT COSθ +W

(d) W-2πrT COSθ

Ans. c

(11)

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