Energy density via permittivity and electric field
==================================================

Volumetric energy density of the electric field depends on the permittivity of the medium and
on the strength of the electric field at that point.

**Links:**

#. `Wikipedia <https://en.wikipedia.org/wiki/Electric_field#Energy_in_the_electric_field>`__.

.. py:currentmodule:: symplyphysics.laws.electricity.energy_density_via_permittivity_and_electric_field

.. py:data:: energy_density

    Volumetric :attr:`~symplyphysics.symbols.basic.energy_density` of the electric field, see
    :doc:`laws.quantities.quantity_is_volumetric_density_times_volume`.

Symbol:
    :code:`w`

Latex:
    :math:`w`

Dimension:
    :code:`energy/volume`


.. py:data:: absolute_permittivity

    :attr:`~symplyphysics.symbols.electrodynamics.absolute_permittivity` of the medium.

Symbol:
    :code:`epsilon`

Latex:
    :math:`\varepsilon`

Dimension:
    :code:`capacitance/length`


.. py:data:: electric_field_strength

    :attr:`~symplyphysics.symbols.electrodynamics.electric_field_strength`.

Symbol:
    :code:`E`

Latex:
    :math:`E`

Dimension:
    :code:`voltage/length`


.. py:data:: law

    :code:`w = epsilon * E^2 / 2`


    Latex:
        .. math::
            w = \frac{\varepsilon E^{2}}{2}