Question

Difference between displacement current and bound current

Answer 1

Displacement current- It is defined in terms of the rate ofchange of electric displacementfield. The units of displacement current are same as that ofelectric current density.Displacement current is not an electric current caused due to moving of charges(called conventional current), but it iscaused by a time varying electric field.

Bound current- Just as for electric fields in matter cause a polarization, magnetic fields cause magnetization. Magnetization behaves exactly as if there were acurrent flowing in and around the object. Magnetization is represented by the M vector, and is a magnetic dipole moment per unit volume.

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Answer 2

Answer:

Difference between displacement current and bound current.

Explanation:

Displacement current:

• Displacement current is the current associated with the displacement electric field (D).
• It happens in the case of capacitors, when the plates are being charged by an external battery, the charge is conducted between the plates by the electric field developed across the plates.
• Displacement current can be given as:

         $I_D = J_DS = S\frac{\delta D}{\delta t}$

           Where S is the area of the capacitor plate.

            $I_D$ is the displacement current.

            $J_D$ is the displacement current density.

            D is related to electric field E as:

            D = εE

            ε is the permittivity of the medium in between the plates.

Bound current:

• A bound current is a current that is bound to the nucleus and can have quantized energies.
• It happens in the case of magnetization of objects.
• Bound current can be given as:

        $J_b = \vec{\nabla} \times \vec{M}$

          Where $J_b$ is the bound current density

          M is the magnetization

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