When a DC flows through a wire, does the electric field vary?

[uzair_ha91]

When a DC flows through a wire, does the electric field vary?
If a changing electric flux produces a magnetic field, then electric field will have to vary constantly, right?
If that's not the case, then what produces a magnetic field around a conductor carrying current?

 

[user111_23]

When a DC flows through a wire, does the electric field vary?
If a changing electric flux produces a magnetic field, then electric field will have to vary constantly, right?
If that's not the case, then what produces a magnetic field around a conductor carrying current?

Yes, that is correct.

The motion of the electrons is what causes the magnetic field to appear.

 

[astrokreng]

Yes, the electric field does vary when a DC (direct current) flows through a wire. This is because the flow of DC creates a constant electric potential difference, which in turn creates a constant electric field along the wire. However, the direction of the electric field remains the same throughout the wire, as the current is flowing in a single direction.

In regards to the second question, the magnetic field around a conductor carrying current is produced by the motion of electrons within the wire. As the current flows through the wire, the electrons are moving in a specific direction, creating a magnetic field around the wire. This is known as the right-hand rule, where the direction of the magnetic field can be determined by pointing the thumb of your right hand in the direction of the current flow, and the curl of your fingers will indicate the direction of the magnetic field. So, while the electric field may remain constant in a DC circuit, the magnetic field is produced by the motion of charged particles within the wire.