# EMF around single charge

1. Sep 9, 2009

### donaldson1967

Does a single isolated charge have an electric field?

2. Sep 9, 2009

Yes.

3. Sep 9, 2009

### donaldson1967

if so - in terms of classical EMF definitions where do the "field lines" go?

4. Sep 9, 2009

### Born2bwire

Out. The electric field is given by Coulomb's law.

$$\mathbf{E} = \frac{q}{4\pi\epsilon_0 r^2} \hat{r}$$

5. Sep 9, 2009

### Staff: Mentor

Or in.

(depending on whether the charge is + or -, of course)

6. Sep 10, 2009

### donaldson1967

so charge DOES have energy? even in the absence for example a voltage gradient?

7. Sep 10, 2009

### Born2bwire

A charge creates its own potential field.