Q46. A thin metal disc of radius r floats on water surface and bends the surface downwards along the perimeter making an angle 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) 2πгT + W
(B) 2πrТсosθ – w
(C) 2πrТcosθ +W
(D) W – 2πrTсosθ