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A thin metal disc of radius `r` floats on water surface and bends the surface downwards along the perimeter making an angle `theta` 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. `2pirT + W`
B. `2pirT costheta - W`
C. `2pirT costheta + W`
D. `W - 2pirT costheta`

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