In physics, the electric displacement field, denoted as Failed to parse (Missing texvc executable; please see math/README to configure.): \mathbf{D} , is a vector field that appears in Maxwell's equations. It accounts for the effects of free charge within materials. "D" stands for "displacement," as in the related concept of displacement current in dielectrics. In free space, the electric displacement field is equivalent to flux density, a concept that lends understanding to Gauss's law.
In a dielectric material the presence of an electric field E causes the bound charges in the material (atomic nuclei and their electrons) to slightly separate, inducing a local electric dipole moment. The electric displacement field D is defined as
where Failed to parse (Missing texvc executable; please see math/README to configure.): \varepsilon_{0}
and P is the (macroscopic) density of the permanent and induced electric dipole moments in the material, called the polarization density. Separating the total volume charge density into free and bound charges:
We've been here in the dark for way too long
Do you remember how it felt in the sunlight?
You're still smiling through the pain you're hiding and...
everyone can see that somethings just not right
You've been waiting for so long, so long
You've been looking for some way to just hold on
CHORUS
I know you feel so far away, far away from better days
As you look for a way out I'll hold on to you
And when it gets too hard to take, I'll be the light that leads the way
As you look for a way out, I'll hold on to you
I'll hold on to you.
You tell yourself that you'll make it right someday
You're getting way too good at living your own lies
I've broken down but I believe somehow that the sun can still burn through the clouds in your eyes
You've been waiting for so long, so long
You've been looking for some way to just hold on
CHORUS
I know you feel so far away, far away from better days
as you look for a way out ill hold on to you
and when it gets too hard to take, ill be the light that leads the way
as you look for a way out ill hold on to you
I'll hold on to you
Take one step, just one step forward
one step, one step
CHORUS [x3]
I know you feel so far away, far away from better days
As you look for a way out I'll hold on to you
And when it gets too hard to take, I'll be the light that leads the way
As you look for a way out, I'll hold on to you
I'll hold on to you.