# Electric field

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.

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.

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

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