# Electric field

1. Jun 23, 2012

### Ryuzaky

Good evening. Can anyone explain me the origin of the electric field in the F-N-L's law ?
I'm referring to this one :

$\int_l \vec E^* d\vec l =-\int_s \frac{\partial \vec B}{\partial t} d\vec S$

where $\vec E^*$ is defined as (i'm reporting the words of the book) :
$\vec E - \vec v \times \vec B$.

in particular what is $\vec E$ and what is its origin.

//I apologize for any syntax/grammar error, I have to improve my English, I'm Italian.

2. Jun 23, 2012

### hexatrien

It's the intensity of the electric field.

$E$$=$$\frac{F}{q}$,
where F is the force, which the field acts on the electric charge

Intensity of the electric field is used to characterize the electric field.

3. Jun 23, 2012

### Ryuzaky

But that is the electrostatic field and its circuitation is 0 !

Last edited: Jun 23, 2012
4. Jun 25, 2012

### cragar

do you want to know where the E field comes from in faradays law or how E is related to B in that equation.