The electric displacement field is defined as:
\boldsymbol{D} = \varepsilon_0 \boldsymbol{E} + \boldsymbol{P}\ =\varepsilon \boldsymbol{E}.

    ?0 is the permittivity of free space
    E is the electric field intensity
    P is the polarization of the medium

The folliwing use RC-circuit to show relation between displacement current and electric field.

To make it easier, the value of ?0 is assigned as 0.5

Un-check the off check box to connect the DC voltage source to the RC circuit (ON).
k is the dielectric constant \varepsilon/\varepsilon_0.
You can adjust voltage source Vs, resistance R, capacitance C.

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