The displacement current density introduced by Maxwell is expressed as

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Problem

The displacement current density JD\mathbf{J}_D introduced by Maxwell is expressed as (a) σ E\sigma\,\mathbf E (b) ε02 ∂E∂t\dfrac{\varepsilon_0}{2}\,\dfrac{\partial \mathbf E}{\partial t} (c) μr ε0 ∂E∂t\mu_r\,\varepsilon_0\,\dfrac{\partial \mathbf E}{\partial t} (d) ε0 ∂E∂t\varepsilon_0\,\dfrac{\partial \mathbf E}{\partial t}

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