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$\bullet$$\bullet$ Surface tension. Surface tension is the force that causes thesurface of water (and other liquids) to form a "skin" that resistspenetration. Because of this force, water forms into beads, andinsects such as water spiders can walk on water. As we shall see,the force is electrical in nature. The surface of a polar liquid, suchas water, can be viewed as a series of dipoles strung together inthe stable arrangement in which the dipole moment vectors areparallel to the surface, all pointing in the same direction. Supposenow that something presses inward on the surface, distorting thedipoles as shown in Figure $17.45 .$ Show that the two slanteddipoles exert a net upward force on the dipole between them andhence oppose the downward external force. Show also that thedipoles attract each other and thus resist being separated. Noticethat the force between dipoles opposes penetration of the liquid'ssurface and is a simple model for surface tension.

So, there exists a strong force of attraction between the adjacent dipoles. Therefore, the dipoles attract each other and will not be separated.

Physics 102 Electricity and Magnetism

Chapter 17

Electric Charge and Electric Field

Gauss's Law

Electric Potential

Rutgers, The State University of New Jersey

Hope College

University of Sheffield

McMaster University

Lectures

13:02

In physics, potential ener…

18:38

In physics, electric flux …

00:32

What is surface tension? H…

03:03

03:31

What is surface tension? G…

01:26

05:41

(III) The dipole moment, c…

03:49

Liquids can interact with …

01:41

What is surface tension? W…

02:50

Van der Waals bonds arise …

03:34

cp van der Waals bonds ari…

00:41

The flat surfaces shown ar…

00:39

02:46

02:23

01:15

03:02

00:38

A solid occupies a region …

01:51

A small object with electr…

02:32

The dipole moment of the w…

01:37

02:51

and this problem, one of the disciples is depressed below the others. And so we have a positive charge here. This is the diaper less depressed, and its neighboring die. Poles are above here, and there are oriented like this. So we have an attractive force F two between this cycle and the cycle, and the reason that's attractive is because I love positive sign here and spacing the minus sign and opposite charges attract and my charges repel same reason why this force F one is attractive over here of a minus sign here on deposits on here, So F one is attractive if you break down F one enough to into its vertical component. Here you get a four sets pushing up, which is opposing the downward applied force. And so that's one of the answers. But now we need to analyze the horse all directions, so there's a horizontal force F two backs, which is pulling to the right, and again it's because I'm a positive sign here in the names on here. And so there's some attraction to the right. There's also some attraction to the left, and that's because there's a minus sign here and a positive sign here. So there's an Afghan hacks point to the left, and in total, these forces usually negate one another. And so there is some stability here. This type always attracted to both disciple in this cycle, and those two things make it so that it's somewhat stable and is what gives water and other polar molecules their service engine. And so I hope that explanation may sense there's not any quantitative part of this problem, so that's precisely the problem.

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