Conductor in a magnetic field

In summary, there is a problem regarding a conducting rod in a uniform magnetic field. Some argue that there will be no induced emf when the rod is moved due to no change in magnetic flux linkage, while others argue that there is an induced emf. It is clarified that when a rod moves in a uniform magnetic field, the charged particles in the rod experience a magnetic force, causing an electric field within the rod. The length of the rod and its movement determine the induced emf. However, if the conductor is immersed in the magnetic field, there may be no induced emf. This is different for a coil of conductor. For a rod, the induced emf is determined by the rate of change of flux. In summary,
  • #1
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There is this problem of a conducting rod being in a uniform magnetic field. When the rod is being moved, some answers that there will not be an induced emf as there is no change in magnetic flux linkage but some answer that there is.

Anyone can clarify?

Thanks.
 
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  • #2
When a rod moves in a uniform magnetic field, the charged particles in the rod experience a magnetic force F = qvBsinθ. Due to this the charged particles start moving towards one end of the rod. That causes an electric field in side the rod, which pushes the electrons in the opposite direction with a force Eq. In the equilibrium condition qE = Bqv Or E = vB. If the length of the rod is L, the emf V = E*L = vBL. So there is an induced emf in the rod.
 
  • #3
What if the conductor is immersed in the magnetic field? Is there a difference?
 
  • #4
You are moving the rod in the uniform magnetic field. What do mean by immersing the conductor in magnetic field?
 
  • #5
I came across some question that states that if a conductor is totally immersed in a magnetic field, it should induce no emf since flux=NBA is always a constant. Is this true?
 
  • #6
If it is a coil of conductor, it is true. But not for a rod.
 
  • #7
Oh! So ok...But for a rod, magnetic flux linkage is also NBA (N=1) right? Whats the difference?
 
  • #8
In the case of the rod, when it moves Flux linkge is B*L*dx. The rate of change of flux is B*L*dx/dt or BLV.
 
  • #9
Ok, ok. So just to clarify, a conductor coil moving in a uniform magnetic field will not experience a emf since there is no change in magnetic flux linkage NBA. But for a rod, there will be an emf experienced since E=Blv and since there is v, there is emf?

Thanks.
 
  • #10
Yes.
 

1. What is a conductor in a magnetic field?

A conductor in a magnetic field refers to a material that allows the flow of electric current and is placed within a magnetic field. This results in the generation of a force on the conductor due to the interaction between the magnetic field and the moving charges within the conductor.

2. How does a conductor behave in a magnetic field?

A conductor in a magnetic field will experience a force perpendicular to both the direction of the current and the direction of the magnetic field. This is known as the Lorentz force and is responsible for the movement of the conductor within the magnetic field.

3. What is the relationship between the strength of the magnetic field and the force on the conductor?

The force experienced by the conductor in a magnetic field is directly proportional to the strength of the magnetic field. This means that as the strength of the magnetic field increases, so does the force on the conductor.

4. Can a conductor be shielded from the effects of a magnetic field?

Yes, a conductor can be shielded from the effects of a magnetic field by using a material that is not affected by the magnetic field, such as a diamagnetic material. This material will create a barrier between the conductor and the magnetic field, preventing any interaction between them.

5. How does a conductor in a magnetic field affect the production of electricity?

A conductor in a magnetic field can be used to generate electricity through the process of electromagnetic induction. As the conductor moves within the magnetic field, it creates a change in magnetic flux, which in turn induces an electric current in the conductor. This is the principle behind generators and electric motors.

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