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A wire 10 cm long is placed horizontally...

A wire 10 cm long is placed horizontally on the surface of water. It is gently pulled up with a force of `1.4 xx10^(-2)` N to keep It in equilibrium . The surface tension of water is

A

50 dyne/cm

B

60 dyne/cm

C

70 dyne/cm

D

40 dyne/cm

Text Solution

Verified by Experts

The correct Answer is:
C
`T = F/(2L) = (1.4xx10^(-2))/(2xx10xx10^(-2))= 0.07 ` N/m = 70 dyne/cm
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