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The displacement current density is

  • A.\( \partial\mathbf{D}/\partial t \)
  • B.\( \partial\mathbf{B}/\partial t \)
  • C.\( \sigma\mathbf{E} \)
  • D.\( \nabla \times \mathbf{H} \)

Answer: A

It has the units of a current density but involves no motion of charge whatever, being the rate of change of the electric flux density. In a capacitor it carries the current across the dielectric and makes the circuit continuous.

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