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Question: A 10 cm long wire is placed horizontally on the surface of water and is gently pulled up with a forc...

A 10 cm long wire is placed horizontally on the surface of water and is gently pulled up with a force of 2 ×10-2 N to keep the wire in equilibrium. The surface tension, in Nm-1, of water is

A

0.1

B

0.2

C

0.001

D

0.002

Answer

0.1

Explanation

Solution

T=F2l=2×10−22×10×10−2=0.1 N/mT = \frac { F } { 2 l } = \frac { 2 \times 10 ^ { - 2 } } { 2 \times 10 \times 10 ^ { - 2 } } = 0.1 \mathrm {~N} / \mathrm { m }