# Gravitoelectromagnetic force

1. Sep 3, 2012

1. The problem statement, all variables and given/known data

There are two force equations in this wiki page: http://en.wikipedia.org/wiki/Gravitoelectromagnetism

2. Relevant equations

3. The attempt at a solution

The conventional Lorentz force is

$$F = q(E + v \times B)$$

It says that the gravielectromagnetic force equation:

$$F = m(E_g + v \times B_g)$$

Is it's gravitational analogue. Yet, the only difference between the equations is that mass and charge have been exchanged.

How can the dimensions be right in the second equation?

Thank you!

2. Sep 3, 2012

### voko

No, that's not the only difference. The other symbols have changed, too. What are their units?

3. Sep 3, 2012

what is $$E_g$$?

I take it then, it's not simply the electric field?

4. Sep 3, 2012

### voko

It's not. The article explains that down to the units involved. Give it another try, just do it carefully :)

5. Sep 3, 2012

Ah it says it is the gravielectric field even. Sorry about that. So what is E_g written out?

6. Sep 4, 2012

### voko

As the article says, it's just the static gravitational field, acceleration due to static gravity (i.e., independent of any accelerated motion).