Test Academy | 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 disc. If the disc displaces a weight of water W and surface tension of water is T, then the weight of metal disc is 2πrT + W, 2πrTcosθ - W, 2πrTcosθ + W, W

Question

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 disc. If the disc displaces a weight of water W and surface tension of water is T, then the weight of metal disc is

Options :

2πrT + W
2πrTcosθ - W
2πrTcosθ + W
W - 2πrTcosθ

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