Electromagnetic Induction in a moving DC circuit

In summary, the conversation discusses the possibility of a self-induced emf in a closed electric circuit consisting of a conducting straight rod connected to a DC voltage source switched on. It is determined that there will be no self induction due to the magnetic field lines not crossing the wire, but in cases involving a coil, there will be self-induction when the voltage is applied and removed. This is how inductors work, as they create a magnetic field when voltage is applied and induce an emf when the voltage is removed.
  • #1
Math Fixxer
2
0
Consider a closed electric circuit consisting of a conducting straight rod connected to a DC voltage source switched on. In steady state the current flowing through the conductor creates a steady magnetic field around it with magnetic flux lines that can be represented as concentric circles "gripping" around the conductor.

My doubt is that if this conductor (or the entire circuit system) is physically moved randomly about, won't there be a variation in the magnetic field around the conductor (although the source of this magnetic field is the current through the conductor itself)? And, if yes, won't this variation in magnetic field around the conductor self induce an emf in the conductor itself (a case of electromagnetic induction)?
 
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  • #2
What is the question in the problem statement that you are being asked to answer.
 
  • #3
JBA said:
What is the question in the problem statement that you are being asked to answer.
Will the physical movement of a dc current carrying conductor cause a self induced emf, when the only magnetic field present is that due to the current in the conductor?
 
  • #4
Sorry to have pushed for more information; but, it appeared to be a far too simple question not have more to it than it did.

The answer is "no" because, as you surmised the magnetic field travels with the wire.
 
  • #5
Apply the right hand rule and you will see that the magnetic lines don't cross the wire in any other point.(there will be no self induction). However, if u make a coil and u apply that rule again, u will see that the magnetic field lines cross the rest of the coil windings. In cases like that, when talking about dirrect current, there will be self induced emf in the moments when the voltage is given and when its taken away. Thats also how inductors work. When u apply voltage they create magnetic field and when u remove the voltage the field collapses, inducing emf on the coil and that emf creates current that opposes the lowering of the supply voltage( the inductor stores energy in its magnetic field)
 

What is electromagnetic induction?

Electromagnetic induction is the process of generating an electric current in a conductor by moving it through a magnetic field or by changing the magnetic field around it.

How does electromagnetic induction work in a moving DC circuit?

In a moving DC circuit, a conductor is moved through a magnetic field, causing the magnetic field to change around it. This change in magnetic field induces an electric current in the conductor, according to Faraday's Law of Induction.

What factors affect the amount of induced current in a moving DC circuit?

The amount of induced current in a moving DC circuit depends on the strength of the magnetic field, the speed of the conductor, the angle between the direction of motion and the magnetic field, and the length and material of the conductor.

What is the difference between AC and DC circuits in terms of electromagnetic induction?

In AC circuits, the direction of the current is constantly changing, which results in a constantly changing magnetic field and therefore, a constantly induced current. In DC circuits, the direction of the current remains constant, resulting in a steady induced current.

What are some real-world applications of electromagnetic induction in a moving DC circuit?

Electromagnetic induction in a moving DC circuit is used in generators to convert mechanical energy into electrical energy. It is also used in electric motors, transformers, and many other electrical devices.

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