A platinum wire ring of radius 2.5 cm floats horizontally on the surface of water . A vertically force of 0.022 N is required to detach the ring from
A platinum wire ring of radius 2.5 cm floats horizontally on the surface of water . A vertically force of 0.022 N is required to detach the ring from the surface of water . Then surface tension of water is
A. `6xx10^(-2)`N/m
B. `8xx10^(-2)`N/m
C. `7xx10^(-2)`N/m
D. `9xx10^(-2)`N/m
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Correct Answer - C
` T = F/(2 xx 2pir ) = (22xx10^(-3)xx7)/(4xx22xx2.5 xx10^(-2))= 7 xx 10^(-2)` N/m
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