- #1

- 488

- 4

[tex]F = -e E[/tex]

where E is the electric field. So the moment should be

[tex]\mu = Fx = -eE x[/tex]

but why this is different from the one in text ([tex]\mu=-ex[/tex]) ? What's wrong in my reasoning?

- Thread starter KFC
- Start date

- #1

- 488

- 4

[tex]F = -e E[/tex]

where E is the electric field. So the moment should be

[tex]\mu = Fx = -eE x[/tex]

but why this is different from the one in text ([tex]\mu=-ex[/tex]) ? What's wrong in my reasoning?

- #2

tiny-tim

Science Advisor

Homework Helper

- 25,832

- 251

Because a moment is

Electric dipole moment, however, is a moment of

(As for the cross product , I think dipole moment uses the

For the first moment, you multiply by one coordinate: M

For the second moment (like an electric quadrupole moment), you multiply by two coordinates: M

and so on.)

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