Question

A 10 cm long wire is placed horizontally on the surface of water and is gently pulled up with a force of 2*100 n to keep the wire in equilibrium the surface tension of water is

Answer 1

Answer:

Explanation:

=> The data given here is,

F = 2*100 = 200 n

l = 10 cm = .1 m

S = ?

=> generally, two surfaces are there on the Liquid film. therefore,

=> As per the formula,

Force = 2 * length * surface tension

∴ F = 2l*S

S = F / 2l

S = 200 / 2 * .1

S = 200 / 0.2

S = 1000 N m^-1

Thus, the surface tension of water is 1,000 N m^-1