Duration: 1:33

0 views

0

A thin metal ring of internal radius \( 8 \mathrm{~cm} \) and external radius \( 9 \mathrm{~cm} \) 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 \( 7.48 \mathrm{~g} \) is required to pull the ring out of water. The surface tension of water is \( \left(\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^{2}\right) \)
(a) \( 80 \times 10^{-3} \mathrm{~N} / \mathrm{m} \)
(b) \( 25 \times 10^{-3} \mathrm{~N} / \mathrm{m} \)
(c) \( 45 \times 10^{-3} \mathrm{~N} / \mathrm{m} \)
(d) \( 70 \times 10^{-3} \mathrm{~N} / \mathrm{m} \)
📲PW App Link - https://bit.ly/YTAI_PWAP
🌐PW Website - https://www.pw.live