Does a wire in a closed circuit induce a voltage on itself?

[rail2k]

According to Faraday's Law a changing magnetic field induces an electric field, an example of this is if you have a wire close enough to another wire with current flowing through it the first wire will also have current run through it because of the induced electric field by the second wire.

As current runs through a wire in a closed circuit a magnetic field is created around the wire, so doesn't that mean that that same magnetic field will induce an electric field which will create more current in the wire? If it does, then is the new current opposing the original current or adding to it?

 

[nasu]

Only when the magnetic field is changing in time (increasing or decreasing).
It may oppose or add. See "inductance" and "Lenz's law".

 

[rail2k]

But in the real world when current runs through a closed circuit doesn't the magnetic field constantly change due to a never steady current, just by extremely small amounts?

And in a perfect circuit, if the circuit is initially open but then you close it won't the magnetic field increase as current first travels through the circuit (extremely fast of course)?

If either of those are right, wouldn't the changing magnetic field induce a current to oppose or add to the original current?

EDIT: If you were using an AC power source, wouldn't the current and the magnetic field constantly be oscillating? So then this would constantly induce current, right?

 

[nasu]

In a DC circuit you will have this effect when you turn ON or OFF the power.
In an AC circuit you will have this induced emf whose effect is described by the "inductive reactance". Look up these terms for more information.

 

[sardar]

Yes, according to Faraday's Law, a changing magnetic field can induce an electric field, which can then create a current in a nearby wire. This phenomenon is known as electromagnetic induction. In the scenario described, the changing magnetic field created by the first wire's current can induce an electric field in the second wire, causing current to flow through it as well.

The direction of the induced current will depend on the direction of the changing magnetic field. If the magnetic field is increasing, the induced current will flow in the opposite direction of the original current, creating a opposing effect. If the magnetic field is decreasing, the induced current will flow in the same direction as the original current, adding to it.

It is important to note that the strength of the induced current will depend on factors such as the distance between the wires, the strength of the magnetic field, and the properties of the wires themselves. Additionally, the induced current will only occur while there is a changing magnetic field present.

In conclusion, a wire in a closed circuit can indeed induce a voltage on itself through electromagnetic induction. The direction and strength of the induced current will depend on the factors mentioned above. This phenomenon is important to consider in circuits and can be utilized in various technologies such as transformers and generators.