Question regarding displacement current

[utkarshakash]

Homework Statement

Displacement current arises due to
a)changing electric field
b)changing magnetic field
c)both

Homework Equations

The Attempt at a Solution

I think the answer should be c) because we already know that changing electric field is responsible for displacement current. But if the magnetic field is also time-dependent then it will induce an electric field according to Faraday's law. So, the induced electric field will also contribute to the displacement current.
However, the correct answer is a).

 

[NascentOxygen]

Others are in a far better position than I to discuss your theory, but I would make 2 comments. (1) The voltage induced in a single turn (?) of an insulating material (the dielectric) by the capacitor's charging current may be minscule. (2) Consider the special case: if you were to charge the cap from a constant-current source, the charging current would be constant and unchanging, so with di/dt =0 there would be no induced voltages anywhere.

 

[utkarshakash]

Others are in a far better position than I to discuss your theory, but I would make 2 comments. (1) The voltage induced in a single turn (?) of an insulating material (the dielectric) by the capacitor's charging current may be minscule. (2) Consider the special case: if you were to charge the cap from a constant-current source, the charging current would be constant and unchanging, so with di/dt =0 there would be no induced voltages anywhere.

I'm sorry but it's still not clear to me.

 

[Rellek]

Hey!

Remember that the current displacement is only defined by the change in your polarization and your change in electric field, both with respect to time.

The magnetic field has no effect on this value.

 

[HalfLostAndSearching]

This may seem counterintuitive, but displacement current is actually a purely electric phenomenon, despite its name. It is not related to the magnetic field or Faraday's law. It arises from the time-varying electric field itself, as described by Maxwell's equations. So, while a changing magnetic field can induce an electric field, this induced electric field is not considered displacement current. Therefore, the correct answer is a) changing electric field.