A thin metal ring of internal radius 8 cm and external radius 9 cm is supported horizontally from the pan of a balance so that it comes in contact with water in a glass vessel. It is found that an extra weight of 7.48 g is required to pull the ring out of water. The surface tension of water is
Text Solution
Verified by ExpertsThe correct answer is:
D
mg = 2 π r 1 T + 2 π r 2 T
7.48 × 10 3 = 2 π (8 + 9) × 10 –2 T
T = 70 × 10 –3 N/m
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